When the secular authority of the Patriarchs of Aquileia came to an end in 1420, Istria was divided between Venice and Austria, and the Habsburgs added the title of Margrave of Istria to their other titles.
Istria was divided between Venice and Austria. The secular authority of the Patriarchs of Aquileia came to an end in 1420. The Habsburgs added the title of Margrave of Istria to their other titles.