Devaki (Sk.). The mother of Krishna. She was shut up in a dungeon by her brother, King Kansa, for fear of the fulfilment of a prophecy which stated that a son of his sister should dethrone and kill him. Notwithstanding the strict watch kept, Devaki was overshadowed by Vishnu, the holy Spirit, and thus gave birth to that god’s avatara, Krishna. (See “Kansa”.)

Source: H.P.Blavatsky - The Theosophical Glossary