With the 1516 Noyon pacts the boundary between the Venetian Republic and the County of Gorizia and Gradisca, now in the hands of the House of Habsburg, were redefined. Venice lost the upper Isonzo valley (that is the Gastaldia of Tolmino with Plezzo and Idria), but it kept Monfalcone, Marano and a series of shed feudal islands in the Western Friuli stayed with the Archduke of Austria (until 1543). Between 1615 and 1617 Venice and Austria again fought for the possession of the fort of Gradisca d'Isonzo. The so-called War of Gradisca ended with a return to the "status quo".