In Greek mythology, Thrassa (Celoria, p. 163 n. 240 to p. 77.), was the daughter of Ares and Tereine, daughter of the river-god Strymon. Hipponous, son of Triballos (eponym or god of the Triballoi (Τριβαλλοί) tribe of Thrace), married her and they had a daughter called Polyphonte. This daughter scorned the activities of Aphrodite and went to the mountains as a companion and sharer of sports with Artemis. Thus, the goddess of love made her fall in love with a bear and drove her mad. Polyphonte eventually coupled with a bear and bore the ursine giants Agrius and Oreion.Antoninus Liberalis, 21
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References
Antoninus Liberalis, The Metamorphoses of Antoninus Liberalis translated by Francis Celoria (Routledge 1992). Online version at the Topos Text Project.