Plyussa

The Plyussa runs through the wooded country north of Pskov before joining the Narva. Ancient settlement sites lie along its banks, and the river gave its name to a truce between Russia and Sweden at the close of the Livonian War. In 1583 Russian and Swedish envoys negotiated the agreement on the Plyussa, temporarily ending their fighting and confirming Swedish control of several fortresses. The river thus lent its name to a settlement of a conflict that had reshaped the Baltic frontier.