 The most powerful noblemen in the region, the House of Zrinski and the House of Frankopan, built numerous castles in the area.They include the castles of Trsat, Grobnik, Bakar, Kraljevica, Ledenice, Bribir, Hreljin, Grižane, Novi Vinodolski, Krk, Drivenik and Gradec near Vrbnik.The most representative piece of Baroque architecture is the St. Vitus Cathedral in Rijeka.