The History of Buddhism: From the Buddha to Today

By Tim Yu · Updated 2026-06-04

The history of Buddhism spans roughly 2,500 years. It begins with one teacher — Siddhārtha Gautama, the Buddha — in the Ganges plain of ancient India, and unfolds into a family of traditions followed across Asia and, today, the world. This is the story of how a regional teaching became one of humanity’s great religions, told without favouring any one branch.

Because Buddhism never had a single head or a single canon, its history is less a straight line than a spreading river. What follows is a chronological map of the main phases, with the honest gaps and live debates left visible rather than smoothed over.

Origins: The Buddha and the First Community (5th c. BCE)

Buddhism began with the life and teaching of the Buddha, a renunciant who taught in the small kingdoms and republics of the eastern Ganges plain — the region of modern Bihar and Uttar Pradesh, near the Nepal border.

His dates are genuinely uncertain, and an honest history has to say so. For centuries the traditional reckoning placed his life at about 563–483 BCE. Since the late twentieth century, however, many scholars have argued for a later range, putting his death closer to 400 BCE. The two pictures differ by roughly a century. What they agree on is that he lived to around eighty and taught for some forty-five years. Anyone who offers a single confident birth year is overstating what the evidence allows.

What the Buddha left behind was not a book but a community — the Sangha of monks and, later, nuns, together with a body of lay followers. (For what that renunciant life involves to this day, see the life of a Buddhist monk.) He framed his teaching, according to the early discourses, around the Four Noble Truths and a path to the end of suffering, and he repeatedly refused to set himself up as an indispensable authority: the teaching, he insisted, was something each person had to verify for themselves. That emphasis — on a path to be tested rather than a creed to be believed — shaped everything that came after.

For the first centuries, the teaching was preserved orally, memorised and chanted by the monastic community. This matters for the history: the texts we have were written down generations later, and the earliest layers were already being interpreted and organised by the community before they were fixed in writing.

Early Development: Councils and the First Schisms

After the Buddha’s death — his parinibbāna — the community faced an obvious problem: how to preserve and agree on what he had taught. Tradition answers this with a series of Buddhist councils, gatherings of monks convened to recite and settle the teaching and the monastic discipline (Vinaya).

The First Council is traditionally said to have met at Rājagṛha shortly after the Buddha’s death, to recite his discourses and rules collectively. The Second Council, traditionally about a century later at Vesālī (Vaishali), dealt with disputes over monastic discipline — points such as whether certain relaxations of the rules were permissible.

It is around this period that the community’s first lasting division appears. The early Sangha split into two broad groupings: the Sthaviravāda (the “Elders,” Pali Theravāda) and the Mahāsāṅghika (the “Great Community”). Scholars debate the exact cause and timing — whether it turned on points of discipline, on doctrine, or on both — but the split is real, and from these roots further subdivisions grew. Later tradition speaks of some “eighteen schools” of early Buddhism (the number is schematic rather than exact). Most of these “mainstream” schools later died out; the Theravāda of Sri Lanka and Southeast Asia is the principal survivor of this early layer, which is why its scriptures preserve so much of the oldest material.

The honest summary: Buddhism was internally diverse almost from the beginning. The neat modern map of “branches” is the downstream result of these very early divergences.

Ashoka: The Great Patron (3rd c. BCE)

The single greatest turning point in Buddhism’s early spread was the patronage of one ruler. Ashoka (reigned c. 268–232 BCE) was the Mauryan emperor who, by his own account in his rock and pillar edicts, was so sickened by the carnage of his conquest of Kalinga that he renounced war for what he called “conquest by dharma.” Encyclopædia Britannica records that the “sufferings that the war inflicted on the defeated people moved him to such remorse that he renounced armed conquests,” and that he then embraced Buddhism.

Ashoka’s significance for Buddhist history is hard to overstate. As Britannica notes, his “vigorous patronage of Buddhism during his reign furthered the expansion of that religion throughout India” — and beyond. He gave lavish support to the Sangha and, crucially, looked outward: he is associated with sending Buddhist missions to distant regions. The Sinhalese chronicle tradition remembers his son Mahinda carrying the teaching to Sri Lanka, where it took deep and lasting root. Tradition also credits Ashoka with convening a Third Council to purify and settle the teaching.

This is the moment a regional Indian tradition began to become an international one. Without Ashoka’s patronage and missions, the teaching of a north Indian sage might never have become a world religion. (The wider story of that diffusion is told in how Buddhism spread.)

The Rise of Mahayana (c. 1st c. BCE – early CE)

Around the turn of the millennium, a major new movement began to take shape within Indian Buddhism: the Mahāyāna, the “Great Vehicle.”

The dating is one of the genuine debates of the field, so it deserves a careful word. New sutras presenting themselves as the Buddha’s word — including the Prajñāpāramitā (“Perfection of Wisdom”) texts — appear to have begun circulating somewhere around the 1st century BCE to the 1st century CE, but the movement developed gradually over centuries and did not announce itself with a single founding event. For a long time it coexisted within the same monasteries as the older schools rather than forming a separate institution.

What distinguished the emerging Mahayana was, above all, the ideal of the bodhisattva — one who vows to attain full buddhahood for the sake of liberating all beings, rather than seeking only one’s own liberation — and an expanded vision of what a buddha ultimately is. Two great philosophical systems gave it intellectual depth:

• Madhyamaka (“Middle Way”), associated with the philosopher Nāgārjuna — usually dated to roughly 150–250 CE (Stanford Encyclopedia of Philosophy) and often called the most important Buddhist thinker after the Buddha himself. Madhyamaka developed the teaching of śūnyatā, emptiness.
• Yogācāra (“Yoga practice,” also called “mind-only”), a later system associated with the brothers Asaṅga and Vasubandhu (around the 4th–5th centuries CE), which analysed the role of consciousness in experience.

These did not replace earlier Buddhism so much as branch from it. The older, non-Mahayana traditions continued — and one of them, the Theravāda, survives to this day.

Spread Across Asia: Sri Lanka, Southeast Asia, and the Silk Road (1st c. CE onward)

From its Indian heartland, Buddhism spread in two broad directions, and the differences in what spread help explain the map of Buddhism today.

Southward and southeast. From Sri Lanka — where Ashoka’s mission had planted it — a form of the older tradition spread through much of mainland Southeast Asia over the following centuries. This is why Sri Lanka, Myanmar, Thailand, Cambodia, and Laos are predominantly Theravāda today.

Northward along the Silk Road. This was the great corridor of transmission. The trade routes linking India to Central Asia and China carried merchants, monks, and manuscripts. The Kushan empire (1st–3rd centuries CE), which straddled these routes, was, in Britannica’s account, a major factor in carrying Buddhism north; its emperor Kanishka (reigned c. 127–150 CE) was a famous patron, and the region of Gandhāra (in present-day Pakistan and Afghanistan) became a great centre of Buddhist art and learning. It was here, in the meeting of Indian and Hellenistic cultures, that some of the first human images of the Buddha were made — though scholars debate whether Gandhāra or Mathura, further east, has the better claim to the earliest, and many now think the two developed in parallel around the 1st–2nd centuries CE.

Along this corridor, Buddhism reached China from around the 1st century CE, with serious translation activity underway by the 2nd century. Its absorption into a civilisation with its own deep traditions — Confucian and Daoist — took centuries and reshaped it profoundly. In China, distinctively East Asian forms flourished, above all Chan (which would become Zen in Japan), with its emphasis on direct meditative insight, and Pure Land, centred on devotion to the Buddha Amitābha and rebirth in his “Pure Land.”

From China, the East Asian transmission continued:

• to Korea, adopted by the kingdoms of the Three Kingdoms period (Goguryeo in 372 CE is the traditional first date);
• to Japan, traditionally introduced via Korea in the 6th century (the dates 538 and 552 CE are both cited in the sources), where it took root and developed its own great schools;
• to Vietnam, which received both East Asian (Chan/Pure Land) and, in its south, Theravāda influences.

These weren’t simply copies of Indian Buddhism. Each culture remade the tradition in its own image — a recurring pattern across all of Buddhist history.

Vajrayana and the Spread to Tibet (from the 7th–8th c.)

A third great current developed in India from roughly the middle of the first millennium CE: Vajrayāna, the “Diamond Vehicle,” also called tantric or esoteric Buddhism. Building on Mahayana philosophy, it added a rich repertoire of ritual, mantra, visualisation, and initiation transmitted from teacher to student.

Vajrayāna’s most consequential journey was to the Tibetan plateau. The standard account distinguishes two waves:

• The first diffusion, from the 7th–8th centuries. King Songtsen Gampo (7th century) opened Tibet to Buddhist influence, and later King Trisong Detsen (8th century) invited Indian masters — including the scholar Śāntarakṣita and the tantric adept Padmasambhava, revered in Tibetan tradition as the figure who tamed the land for the Dharma — and founded Tibet’s first monastery, Samyé.
• The second diffusion, from around the 10th–11th centuries, after a period of disruption. Tibetan translators and Indian teachers recovered and re-established the lineages, out of which Tibet’s main schools eventually crystallised.

The result is Tibetan Buddhism, a tradition that preserves a great deal of late Indian Mahayana and Vajrayāna learning that was later lost in India itself. As we will see, that preservation would matter enormously in the modern era.

Decline in India (largely gone by the 12th–13th c.)

One of the strangest facts in this whole story is that Buddhism, born in India, had largely disappeared from the land of its birth by around the 12th–13th centuries. Why is a real and unresolved scholarly debate, and a trustworthy account should present it as such rather than pick a single villain. (We weigh the competing explanations in why Buddhism declined in India.)

Historians weigh a combination of factors:

• Loss of patronage. Buddhism depended heavily on royal and merchant support for its monasteries. As that support shifted, the institutions weakened.
• The resurgence of Hindu traditions. Devotional and philosophical movements within the broader Indian religious world grew vigorously, and some absorbed elements of Buddhism, blurring the lines and reducing Buddhism’s distinctiveness.
• Institutional concentration. Some scholars (such as Lars Fogelin) argue that concentrating monastic life in a few great universities like Nālandā made the tradition fragile — when those centres fell, much of its institutional backbone fell with them.
• The invasions of the 12th–13th centuries. The great monastic universities of the northeast, Nālandā among them, were sacked during this period, and monastic communities were scattered. Scholars such as Randall Collins argue that Buddhism was already in decline before this, but that the destruction of its institutions made the loss close to terminal.

What is not in dispute is the outcome: monks fled — many toward Tibet and Nepal, others south — and the unbroken monastic Buddhism of the Indian heartland came to an end. The tradition lived on, vigorously, everywhere it had been transplanted; it simply went quiet at home for many centuries.

The Modern Era: Revival, Modernism, and the Global Turn

The last two centuries reopened the story in dramatic ways.

Colonial-era revival and “Buddhist modernism.” From the nineteenth century, encounters with European colonialism and scholarship — and with Christianity — prompted a wave of Buddhist self-renewal across Asia. Reformers re-presented Buddhism as rational, ethical, and compatible with science. In Sri Lanka, Anagārika Dharmapāla (1864–1933) founded the Maha Bodhi Society (1891) and campaigned to revive Buddhism, including in India. This broad movement is often called Buddhist modernism — an emphasis on meditation, textual study, and a Buddhism stripped (its proponents argued) of mere ritual accretion. It shaped, among much else, the global “mindfulness” movement that grew later in the twentieth century.

Buddhism returns to India. In a striking reversal, Buddhism took new root in its homeland in 1956, when the Indian jurist and Dalit leader B. R. Ambedkar publicly converted to Buddhism at Nagpur, and hundreds of thousands of his followers converted with him — a movement of social as well as religious significance that continues today.

The Tibetan diaspora. After the events of 1959, the 14th Dalai Lama and tens of thousands of Tibetans went into exile in India and beyond. Tragic in its cause, the diaspora had an unintended consequence: it carried Tibetan Buddhism — and its remarkable storehouse of late Indian learning — to a global audience for the first time.

Transmission to the West. Through immigration from Asia, through returning travellers and teachers, and through the diasporas above, Buddhism became a living presence in Europe, the Americas, and Oceania during the twentieth century — as both a heritage tradition for Asian communities and a path adopted by converts.

How many Buddhists today? Here, too, honesty requires care. By formal religious affiliation, the Pew Research Center estimated roughly 324 million Buddhists worldwide in 2020 (down from about 343 million in 2010). But Pew itself cautions that this undercounts Buddhism’s real footprint, because in much of East Asia people practise Buddhism while not formally identifying as “Buddhist,” and the tradition is often interwoven with local religion. Broader estimates that try to capture these practitioners run considerably higher — which is why the figure of around half a billion is frequently cited. Both numbers are defensible; they are simply measuring different things.

A Timeline of Buddhist History

Dates marked “traditional” or “c.” are approximate, and the earliest of them are disputed (see the relevant sections above).

• 5th c. BCE — The Buddha lives and teaches in the Ganges plain (traditional c. 563–483 BCE; many scholars favour c. 480–400 BCE). The first Sangha is formed.
• c. 4th–3rd c. BCE — Early councils; the first schism into Sthaviravāda and Mahāsāṅghika; the early “schools” develop.
• c. 268–232 BCE — Reign of Ashoka; missions carry Buddhism across and beyond India, including to Sri Lanka.
• c. 1st c. BCE – 1st c. CE — Mahayana sutras begin to circulate (dating debated).
• 1st–2nd c. CE — Buddhism spreads along the Silk Road; the Kushan empire and Gandhāra are key; Buddhism reaches China.
• c. 150–250 CE — Nāgārjuna systematises Madhyamaka philosophy.
• 4th–6th c. CE — Yogācāra develops; Buddhism reaches Korea (372 CE) and then Japan (6th c.).
• 7th–8th c. CE — Vajrayāna’s first diffusion to Tibet (Songtsen Gampo; Trisong Detsen; Padmasambhava; Samyé).
• 10th–11th c. CE — Tibet’s second diffusion re-establishes the lineages.
• 12th–13th c. CE — Buddhism largely disappears from India (causes debated; Nālandā and other monasteries destroyed).
• 19th–20th c. — Colonial-era revival and Buddhist modernism; Dharmapāla and the Maha Bodhi Society.
• 1956 — Ambedkar’s conversion brings Buddhism back to India.
• 1959 onward — The Tibetan diaspora carries Tibetan Buddhism worldwide.
• 20th–21st c. — Buddhism becomes a global religion; hundreds of millions of adherents today.

Why Buddhism’s History Looks Like a River, Not a Line

Step back, and a pattern emerges. Buddhism has no single founder-after-the-founder, no central authority, and no single scripture binding on all Buddhists. Wherever it travelled, it was remade — by Sri Lankan chroniclers, Chinese translators, Tibetan yogis, Japanese Zen masters — while keeping a recognisable core: the Buddha, his teaching, and the community.

That is why an honest history resists the phrase “Buddhism says.” There are Buddhisms, plural, each the product of a particular journey through time and culture. The living results of these journeys are the great traditions we explore elsewhere — Theravāda, Mahayana and its Zen and Pure Land forms, and Tibetan Vajrayāna — gathered in our overview of the branches of Buddhism.

This history also left visible marks you can still walk to and take part in today. The places of the Buddha’s life became the four great pilgrimage sites; monasteries and shrines became the Buddhist temples of every Buddhist land, and monuments such as Java’s vast ninth-century Borobudur still stand as stone records of the tradition’s reach. The teaching is carried in a shared vocabulary of Buddhist symbols and lived out in rites of passage like Buddhist funerals. And it is marked through the year in Buddhist festivals — most importantly Vesak, which remembers the Buddha’s birth, awakening, and passing together, and regional observances such as Japan’s Obon, when families honour their ancestors.

For where the whole story begins — the man behind it all — start with who the Buddha was.