The county of Kastl lay in the Bavarian Nordgau, based around the town of Kastl south-west of Amberg in the present-day Bavarian region of Oberpfalz west of the border with the Czech Republic.
Wegener cites the 14th century Kastler Reimchronik which refers to the father of Hermann Graf von Kastl as a son of Ernst I Duke of Swabia. There is presumably confusion with Hermann IV Duke of Swabia, the son of Duke Ernst.
Wegener also suggests that Hermann was the brother of Gebhard I Graf von Sulzbach, and that they were both sons of Hermann IV Duke of Swabia. However, this is difficult to sustain chronologically considering that Duke Hermann married in 1035 while Graf Hermann had at least two children before his death in 1056.[1]
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