Iphis (Ἶφις) is the Greek word for "strength." In Ovid's Metamorphoses Book 9, **Iphis was the Cretan girl raised as a boy by her mother to save her from infanticide** — on her wedding day to her female betrothed Ianthe, the goddess Isis transformed Iphis into a man so they could marry.
One of the earliest preserved tales of gender transformation in Western literature.
Iphis reduces to three — the number of Greek transformation.