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There is no goddess Eostre that we can confirm from primary sources.
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Eostre.
Ostara, the festival held in honour of the Greek Goddess Eostre, was originally documented by Bede, in his 8th century work De temporum ratione.
The following links have more information about Bede, and Eostre.
The Anglo-Saxon goddess Eostre, goddess of spring and fertility