Cylon, one of the Athenian nobles and a previous victor of the Olympic Games, attempted a coup in 632 BC with support from Megara, where his father-in-law, Theagenes was tyrant.
Stephanus Byzantius calls it Parthenopolis and relates according to Theagenes the legend of its foundation by Grastus, son of Mygdon, said to have named the city in honour of his two daughters.