Siderokastron (Greek: Σιδηρόκαστρον) was a medieval fortified settlement on Mount Oeta in Central Greece.
[1] Some scholars have identified it with a place on Mount Knemis (Buchon), Delphi or Arachova (Gregorovius), or Heraclea Trachis (Neroutsos),[2] but based on the description in the Chronicle of the Morea, it is most likely to be identified with the ruined fortified settlement on a rocky plateau found on an eastern outlier of Mount Oeta, on the banks of the upper course of the Asopos River near the modern villages of Pavliani and Koumaritsi.
[3] Its name ("Iron Castle" in Greek) possibly derives from the nearby pass of Sideroporta, which gave it a certain strategic importance, as it controlled the mountain roads from the Asopos to the Boeotic Cephissus, and to Dyo Vouna.
[4] It is first mentioned in 1275 as one of the castles ceded by the ruler of Thessaly, John I Doukas, to the Duchy of Athens, as the dowry of his daughter Helena Angelina Komnene.
Except for an (uncertain) brief occupation by Albanian raiders in 1367, it remained in the hands of various Catalan families at least up to 1382, and possibly until the Ottoman conquest of the County of Salona in 1392.