The Treaty of Teusina (Finnish: Täyssinän rauha, Russian: Тя́взинский ми́рный догово́р), also known as the Eternal Peace with Sweden in Russia, was concluded by Russian diplomats under the boyar Afanasiy Pushkin (an ancestor of the poet Aleksandr Pushkin) and ambassadors of the Swedish king at the village of (Finnish: Täyssinä, Swedish: Teusina) in Ingria on 18 May 1595 to end the Russo-Swedish War (1590–95).
The treaty revised provisions of the Truce of Plussa in 1583. It restored all territory ceded to Sweden back to Russia, except for Narva. Russia received most of Ingria, with the towns of Ivangorod, Jama, Koporye and Korela Fortress. The treaty restored the borders predating the Livonian War. The Swedish-Russian border was delineated from the outstream of the Systerbäck river into the Gulf of Finland, over the lakes Saimaa and Inari, the settlement of Neiden and up to the Murman Sea. Russia had to renounce all claims on Estonia, including Narva, and they had to accept Swedish sovereignty over Estonia.
Sweden and Russia had signed a truce two years prior after the death of John III of Sweden. The Swedes were suing for peace due to the loss of their king, and worries over the status of the Swedish army stationed in Estonia due to a lack of funds.
Sigismund, a son of the Polish king John I, was named as the new king in Sweden. However, the nation was soon in inner turmoil caused by a power struggle between the new king and his uncle and future king Charles IX.
Russia was ruled by Tzar Fyodor I Ivanovich, but the de facto power was held by the future Tzar and current advisor to the Tzar, Boris Godunov.
King Sigismund stated, that the minimal demands set by the Swedes would be a return to pre-war borders, and gain some compensation over territories.
The negotiations were held, with the Russian delegation using the Swedish power struggle to their advantage and threatening to abandon negotiations. The final agreement was reached in May of 1959.
Other details in the agreement included an exchange of prisoners without ransom, the safety of Russian citizens and their property, and that Russian foreign trade was to be handled through Vyborg and Tallinn, and not from Narva or the Russian ports on the Baltic Sea.
The peace treaty was commercially beneficial to Sweden, due to designating Vyborg and Narva as international hubs for trade. Russia managed to avoid handling their trade through the Swedish territories.
The Treaty of Teusina ended a 25 year period of destructive war. Tens of thousands of civilians were killed, which at that time was a much larger portion of the total population in the regions the war was waged on.
The borders set in the peace treaty remained as such for 22 years, until the Peace of Stolbov in 1617.