The regional center of Ercis (pop. 37,000) lies a good 115km/70mi north of Van. Known to be well-established as early as the 11th century, in Armenian times it was called Agantz and was one of the most important towns of that period. In 996 David of Taik annexd Ercis and Manzikert (Malazkirt) to the Armenian province of Karin (Erzurum), in 1055
it fell to the Seljuks and in the 14th century to the Turkmans, whose princes resided here from time to time. Around 1840, a catastrophic flood occurred when the level of Lake Van rose forcing the inhabitants around the lake (Agantz) to move to new homes, the villages of Plohur, Gazimbag and Celebibag. Some of the old town is still under water or else in the marshy terrain near Eski Ercis Kalesi.
One remaining feature of the old town is a simple domed tomb, the Yar Ali Türbesi (also known as the Hargin Türbesi or Kadem Hatun Pasa Türbesi). It almost certainly dates from the days of the Karakoyun dynasty and can be found in an historic cemetery about 3km/2mi southeast of the town on the road to Van. Most of the other tombs have been destroyed.