Apollo, Iris, Marpessa and Idas. Marpessa was a grand-daughter of Ares, an Aetolian princess. Kidnapped by Idas but loved by Apollo as well. Zeus made her choose between them. According to another myth the daughter of the river god Euenus and Alcippe. Her husband Idas kidnapped her with a winged chariot, as a challenge to her father, who after chasing the couple for a long time, killed his horses and then drowned himself in a nearby river, which took his name.