In the union with Hungary, institutions of separate Croatian statehood were maintained through the Sabor (an assembly of Croatian nobles) and the ban (viceroy). In addition, the Croatian nobles retained their lands and titles. Coloman retained the institution of the Sabor and relieved the Croatians of taxes on their land. Coloman's successors continued to crown themselves as Kings of Croatia separately in Biograd na Moru. The Hungarian king also introduced a variant of the feudal system. Large fiefs were granted to individuals who would defend them against outside incursions thereby creating a system for the defence of the entire state. However, by enabling the nobility to seize more economic and military power, the kingdom itself lost influence to the powerful noble families. In Croatia the Šubić were one of the oldest Croatian noble families and would become particularly influential and important, ruling the area between Zrmanja and the Krka rivers. The local noble family from Krk island (who later took the surname Frankopan) is often considered the second most important medieval family, as ruled over northern Adriatic and is responsible for the adoption of one of oldest European statutes, Law codex of Vinodol (1288). Both families gave many native bans of Croatia. Other powerful families were Nelipić from Dalmatian Zagora (14th–15th centuries); Kačić who ruled over Pagania and were famous for piracy and wars against Venice (12th–13th centuries); Kurjaković family, a branch of the old Croatian noble family Gusić from Krbava (14th–16th centuries); Babonići who ruled from western Kupa to eastern Vrbas and Bosna rivers, and were bans of Slavonia (13th–14th centuries); Iločki family who ruled over Slavonian stronghold-cities, and in the 15th century rose to power. During this period, the Knights Templar and the Knights Hospitaller also acquired considerable property and assets in Croatia.