The ruins of KOŠECA / Kasza castle stand on a barren mountain east of Košeca village. Under the Árpád dynasty, the castle had been owned by Comes Smaragdus and became a royal estate thereafter. In 1467 King Matthias Corvinus gave it to Balázs Magyar, who shared it with his son-in-law, Pál Kinizsi. In 1493, the estate devolved on the Zápolya family, who mortgaged it to Pál Petróczy in 1526; the latter was granted ownership by Ferdinand I of Habsburg. One of his descendants, István Petróczy, became involved in the Wesselényi conspiracy in 1670 and the castle was subsequently pulled down by Habsburg troops. Malé Košecké Podhradie / Kis-Podhrágy, the village below the castle, had ca. 550 Slovak inhabitants in the mid-19th century.

Bibliography: Fekete Nagy, Kerekes, Kristó, Lovcsányi, Mednyánszky 1844, Mednyánszky 1981, Pechány