House Thorne is a princely house located in northwestern Norica within the Hollinwood. Their sigil is a green holly bush on a white field. The seat of their house is High Hearth. Ammian Thorne was the first Prince of High Hearth and founder of this house. The current Prince is Alister Thorne, who led Norican forces to victory in the Battle of the Brushfire.

House Thorne is descended from Noric through his sister Anela. Their claim to the throne of Norica during the War of the Four Princes was dismissed due to laws of male primogeniture.