Thetis

Thetis was one of the 50 Nereids, mother of Achilles by Peleus. Silver-footed disposer or "placer" (the one who places), is encountered in Greek mythology mostly as a sea nymph or known as the goddess of water, one of the fifty Nereids, daughters of the ancient sea god Nereus. In the Trojan War cycle of myth, the wedding of Thetis and the Greek hero Peleus is one of the precipitating events in the war, leading also to the birth of their child Achilles.