Umaswati
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Acharya Umaswati is the author of Tattvartha Sutra, the best known Jaina text. The details of his life are controversial. He is claimed by both the Digambaras and the Shvetambaras.
He is thought to have lived around the 2nd century BC. It is likely that at this time, no clear division of the Jain Sangha had emerged, and thus both sects may be right in claiming him.