After the extinction of the Counts Ortenburg on 28 April 1418, the Counts of Celje inherited their area holdings, expanding the castle into a formidable fortress and renaming it Schloss Grauenwarth, although the surrounding settlement retained the Slavicised Latin name Kostel.
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At the end of the 15th century, the castle was received as dowry by Boltežar the noble Wagen, imperial administrator of the castles of Hošperk by Planina and Šteberk in Cerknica, as well as lord of Kostel Castle near the river Kolpa.