Was Leto was a titan daughter of Coeus and Phoebe. She was also one of the wives of Zeus with him she had two children Apollo the sun god and Artemis goddess of hunting. Before the birth of Artemis and Apollo Hera placed a cursed on her that kept from delivering the twins on land.
Poseidon offered Leto the Island of Delos because he was at the time in a tiff with Hera.
Artemis was delivered before Apollo, With that she aided her mother to deliver her twin brother minutes later, thus becoming the goddess of childbirth.