Leto was a Human female living in the 3rd millennium BC in Greece on Earth.

According to Greek mythology, Leto, a mortal turned Greek goddess, had two children with the Greek god Zeus, Apollo and Artemis. This story was later confirmed by Apollo himself, who like Zeus, Artemis and all other ancient Greek gods was in reality a member of a powerful race of alien beings who once visited Earth. (TOS: "Who Mourns for Adonais?")

This character was only mentioned in dialogue.
For the Star Trek Encyclopedia (3rd ed., p. 18), the authors used the Latinization form of her name, Latona, for the entry on Apollo.

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