Principality of Jersika

The Principality of Jersika (Latin: Gerzika, terra Lettia; German: Gerzika, Zargrad; Russian: Герсикское княжество, Ерсикское княжество) was a medieval Latgalian principality in the east of modern-day Latvia, and one of the largest medieval states in Latvia before the Northern Crusades. The capital of Jersika was located on a hill fort 165 kilometres (103 mi) southeast of Riga. In documents dating to the 13th century, the western part of the principality was called Lettia, and the eastern part by the Russian name Lotygola.