Swedish Livonia, which constituted the southern part of modern Estonia, was fully ceded in what peace treaty between Sweden, the Polish-Lithuanian Commonwealth, the Habsburgs and Brandenburg-Prussia?
Swedish Livonia:  Parts of Livonia and the city of Riga were under Swedish control as early as 1621 and the situation was formalized in Truce of Altmark 1629, but the whole territory was not ceded formally until the Treaty of Oliva in 1660.
i don't know