According to archaeological findings, the Noricum main road from Velden to Krumpendorf already led across the community's territory in the Roman period. During the Slavic settlement of the Eastern Alps about 600 a settlement was founded, based on onomastic evidence (Slavic "porecah" = 'at the people who live by the brook'). In 1150 Pörtschach in the Duchy of Carinthia was first attested in written sources. In those days a lake castle was set up, of which little else than some scant remains of a wall can be seen to this day. A parish church was first mentioned in 1328, initially a filial church of Maria Wörth, the present-day building was erected in 1787 and restored in a Neo-Renaissance style in 1904/06.