According to Bede the Bard in the treatise De temporum ratione (725 DC) Eostre deriving its name from the term aus / aes which means East, where the sun is born, for this Eostre is a goddess of fertility and rebirth. From Eostre also derives the Celtic term Eostur-Monath, that is the spring equinox and then Ostara. The link between Eostre and spring is confirmed by the German word Oster (Easter) and the English Easter, which contains both the meaning of Easter and Spring.