The Buddha’s teaching travels from a regional landscape
Traditions locate key moments of the Buddha’s life at Lumbini, Bodh Gaya, Sarnath and Kushinagar. Monastic communities then carried his teachings along routes already linking courts, towns and merchants.
The exact dates of the historical Buddha remain debated. The geography is clearer than the chronology: the early Buddhist world stretched across several competing polities rather than one unified state.
Source: Britannica: Buddhism—Historical development
Mahavira reshapes an older ascetic tradition
Jain tradition remembers Mahavira as the twenty-fourth Tirthankara, associated with the wider Vaishali region and the renunciation of worldly life. Jain communities developed durable ethical disciplines centred on non-violence, restraint and liberation.
Buddhist and Jain traditions grew in dialogue with Brahmanical and other ascetic schools. Their success shows that intellectual life in the Ganga plain was plural and institutionally competitive.
Source: Encyclopaedia Britannica: Mahavira