Sweden had pushed east into Karelia, right into the lands where Novgorod collected its tribute. In the summer of 1318 Novgorod struck back. Its target was the heart of Swedish Finland: Turku.
Two powers, one frontier
- Novgorod was a rich Orthodox trading republic in the east. It controlled the river routes to the Baltic and collected tribute in fur from the Karelians Well documented.
- Sweden pushes east. In 1293 a Swedish expedition builds Vyborg Castle in Karelia. In 1300 the Swedes build Landskrona where the Neva meets the sea, on Novgorod’s main trade route. Novgorod destroys it the next year Well documented.
- Tit for tat. In 1317 a Swedish force raids near Lake Ladoga. It was probably one more reason for what came next Likely.
The raid of 1318
- Along the coast. In the summer of 1318 a Novgorodian force sails west along the Finnish coast Well documented.
- 11 July. The defenders of Turku are overwhelmed, and the town is burned and plundered Well documented.
- Kuusisto. The bishop’s manor at Kuusisto, southeast of Turku, is captured and burned. The bishop’s archives are said to have burned with it, and with them much of Finland’s earliest written history Likely.
- The castle holds. The castle commander Lyder van Kyren, a knight from Holstein, defends the castle. Unable to take it, the Novgorodians withdraw Well documented.
- And the cathedral? The parish history says the cathedral burned and stayed in poor shape for decades. Other accounts mention only the town and Kuusisto Debated.
Peace at Nöteborg
- After a few more years of fighting both sides were exhausted. On 12 August 1323 Sweden and Novgorod made peace at Nöteborg, an island fortress where the Neva flows out of Lake Ladoga. Hanseatic merchants, who wanted safe trade, pushed for the peace Well documented.
- The first border. For the first time a border was drawn through Finland. In the south its course is clear: across the Karelian Isthmus. Further north it is vague, and for centuries the two sides read it in their own favour Debated.
- West and east. West of the line, Finland followed Swedish law and the Catholic Church. East of it, Karelia looked to Novgorod and Orthodox Christianity. The line shaped Finland for centuries.
The raid is known from a few short entries in medieval chronicles and from later accounts. They agree on the outline: the town burned and the castle held. They disagree on details, such as whether the cathedral burned. The burned archive at Kuusisto is one reason why so few documents survive from Finland before the 1300s.