What is "castelbrando"

Castel Brando, former Castrum Costae, is a medieval castle situated on a dolomite limestone rock at an elevation of above sea level, overlooking the villages of Cison di Valmarino and Valmareno, Northern Italy. The name Castel Brando is due to the name Brandolini, the ancient family from Forlì, who were the Lords of the castle.