Buddhist councils at English => English (The Britannica Concise) Of Explained:
In most Buddhist traditions, two early councils on doctrine and practice. The first, which most modern scholars do not accept as historical, was reputedly held at Rajagrha (modern Rajgir), India, during the first rainy season after the Buddha's death, to compile his remembered words, incl. the sutras and monastic rules. The second, which is accepted as historical, met more than a century later at Vaisali, India, to resolve disputes within the monastic community. Theravada Buddhism recognizes subsequent councils: a third, called by Ashoka c.AD 247, at which the doctrinal disputes were resolved in its favor, and others continuing up to the mid-20th cent. Other Buddhist traditions recognize other important councils at which their respective canons were established or edited.