Friedrich I. von Kastl und Habsberg, Count of Kastl, Count of Habsberg, was born on an unknown date to Hermann von Kastl (?-1056) and Hadegunde von Regensburg (?-c1104) and died 1103 of unspecified causes. He married Berta von Schweinfurt (?-1103) 1075 JL .
Children
| Name | Birth | Death | Joined with |
| Hermann III. von Kastl (c1076-bef1125) | 1076 | 1125 | |
| Otto von Habsberg (c1078-c1125) | 1078 | 1125 | Adelheid Unknown (?-1105) |
| Friedrich von Ammertal (c1080-bef1025) | 1080 | 1125 | |
| Judith von Kastl (c1082-) | 1082 | ||
Residences
Footnotes (including sources)
| ‡ General |