On which river does Hamburg stand?
Hamburg origin of the "Hamma" term remains uncertain, as does the exact location of the castle. In 834, Hamburg was designated as the seat of a bishopric. The first bishop, Ansgar, became known as the Apostle of the North. Two years later, Hamburg was united with Bremen as the Bishopric of Hamburg-Bremen. Hamburg was destroyed and occupied several times. In 845, 600 Viking ships sailed up the River Elbe and destroyed Hamburg, at that time a town of around 500 inhabitants. In 1030, King Mieszko II Lambert of Poland burned down the city. Valdemar II of Denmark raided and occupied Hamburg
Great stand on the Ugra river Great stand on the Ugra river The Great Stand on the Ugra River (, also , derived from "Ugra") was a standoff between the forces of Akhmat Khan of the Great Horde, and the Grand Prince Ivan III of Muscovy in 1480 on the banks of the Ugra River, which ended when the Tatars departed without conflict. It is seen in Russian historiography as the end of Tatar rule over Moscow. The main Russian defense line ran along the Oka River from Kaluga east toward Nizhny Novgorod. At Kaluga the Oka bends sharply from north to east and the defense