The Tretomlec were a pre-historic tribe of men and women who were at war with a nearby tribe of Cannibals. After all the Tretomlec men had been killed the women had no choice but to become warriors. With the help of a girl from the future, who became the first Cyane, the Tretomlec women reinvented themselves as the Amazons. Eventually, a great Amazon Nation was born from the former Tretomlecs.
The Tretomlec were known to eat horses (which they called the "Swift Ones") until Cyane taught them how to ride the animals. This new-found skill was, in part, what led to the Tretomlec being able to defeat their cannibalistic enemies.