Mežotne hillfort (Latin: castrum Mesiothe), also known as Viesturs’ Hill, is located in Rundāle municipality, across from the centre of Mežotne town, on the left bank of the Lielupe river. According to the Livonian chronicles, the main castle of the Semigallian land of Upmale stood here until 1270. After its destruction, to defend against the Lithuanians, the Livonian order built the Mežotne castle, which existed for a short time (ca. 1321-1346).