>>508016439
Well in that particular case, the "horns" are the horns of cuckoldry - Hera being forced to watch as her husband Zeus commits another infidelity. However, Mycenaean and especially Minoan depictions of gods and priestesses and warrior-kings has them wearing horned headdresses and helmets from time to time, particularly due to Minoan veneration of the bull. The same is true of Canaanite religious icons.