Varnhem is the location of the oldest known stone church in Sweden outside of my native Scania, erected in the 1040s at the latest. It is also the location of a Christian cemetary which was in use during the end of the ninth century.
Varnhema and in particular its abbey has received additional attention in recent years due to it being the main location of The Knight Templar trilogy written by Jan Guillou, and subsequently filmed. Arn Magnusson, the hero character of the series is portrayed as living there.
Birger jarl and his family lie buried in Varnhem.
[Quoted from Wikipedia]
As it happens, my best friend lives very close to this church.