The name of Amphictyon has a back-formation from Amphictyons, plural, from Latin Amphictyones, from Greek Amphiktyones, Amphiktiones, literally, "neighbors" or "those dwelling around" from amphi- + -ktyones, -ktiones (from ktizein to found); akin to Sanskrit k?eti he dwells, k?iti abode, Avestan shitish dwelling, Armenian ?en inhabited, cultivated.
Amphictyon was the second son of Deucalion and Pyrrha, although there was also a tradition that he was autochthonous (born from the earth); he is also said to be a son of Hellen son of Deucalion and Pyrrha. Amphictyon was king of Thermopylae and married a daughter of Cranaus of Athens. According to some accounts this daughter was named Atthis, although this conflicts with other accounts which relate that she died young as an unmarried virgin. Amphictyon eventually deposed Cranaus, proclaiming himself king of Athens.
Amphictyon ruled Athens for ten, or in some accounts, twelve years and founded the Amphictyonic League, which traditionally met at Thermopylae in historical times. During his reign, Dionysus was supposed to have visited Amphictyon in Athens and taught him how to mix water with wine in the proper proportions. Amphictyon was deposed by Erichthonius, another autochthonous king of Athens.