Officially, Wenden Voivodeship belonged to Poland–Lithuania until the Treaty of Oliva in 1660. Its capital was Wenden, where local sejmiks of the nobility (see szlachta) took place. Wenden Voivodeship elected two deputies to the Sejm of the Polish–Lithuanian Commonwealth. Even though it no longer belonged to the Commonwealth after the Swedish conquest, its voivodes continued to be named by Polish kings until the final partition of Poland (1795), as the so-called "fictitious titles" (Polish: urzędy fikcyjne).