Why do accounts of the Buddha’s life differ among Buddhist traditions?

Accounts of the Buddha’s life differ among Buddhist traditions primarily because there was no single, comprehensive biography composed during his lifetime or immediately following his death. Instead, the biographical tradition developed over centuries through the synthesis of independent fragments, oral traditions, and doctrinal discourses.12

Key factors contributing to these variations include:

• Evolution of Literature: Early accounts were scattered across sutras and vinaya texts, which focused on teachings and monastic discipline rather than continuous narrative. Full biographies, such as the Buddhacharita, did not appear until the 2nd century CE.1
• Regional and Doctrinal Needs: As Buddhism spread to new regions like Sri Lanka, Kashmir, and Myanmar, narratives were often expanded to include magical visitations or to retrospectively sanctify local pilgrimage sites by claiming the Buddha had visited them.1
• Pattern Conformity: Many later biographies were written to demonstrate that the Buddha’s life conformed to a specific, recurring pattern followed by all past buddhas, rather than to provide a strictly historical record.1
• Scholarly Perspective: Modern scholars have shifted from seeking "authentic" historical details to studying the social, political, and institutional motivations behind these regional and sectarian narrative differences.1