Cydantidae or Kydantidai was a deme in ancient Attica, originally of the phyle of Aegeis, after 224/3 BCE of the phyle of Ptolemais, sending one or two delegates to the Athenian Boule.[1]
This deme, along with that of Ionidae, venerated the kolokratai; these two demoi were the only ones, as far as we know, to venerate deities together.[2]
Its site is located near Mendeli Monastery.