In 1238 Grožnjan was the property of Vicardo I Pietrapalosa. In 1286, Grožnjan fort was lent to the Aquileian patriarch during war with Venice but changed sides in 1287, and Grožnjan was given to Venice.
In 1238, Grožnjan was owned by Vicardo I Pietrapalosa. In 1286, the Grožnjan fort was leased to the Aquileian patriarch during a war with Venice but switched sides in 1287 and returned to Venetian control.