The Siege of Rhewengrad (Dwarven: Krazdan eron Kal'Rhewen) was a four month long siege during the Eighteen Years' War of the Urguanite fortress of Rhewengrad by the Imperial forces of John I, Holy Orenian Emperor and his generals Josef Vladov and Henry Rothesay. The dwarven forces were commanded by Lord Marshal Belegar Ireheart, with the notable Dunamis presence led by Richard Revlis. The fortress of Rhewengrad was a key fortification for both the Empire and Urguan, having been constructed on order of Grand King Rhewen Frostbeard near the beginning of the war.