Beatrix Cuyk von Rietberg was born circa 1280 to Konrad II. von Rietberg (c1255-1313) and Mechthild and died circa 1329 of unspecified causes. She married Wilhelm von Arnsberg (c1277-1338) . Alfred the Great (849-899)/s, Charlemagne (747-814)/s.
Children
| Offspring of Beatrix von Rietberg and Wilhelm von Arnsberg (c1277-1338) | |||
| Name | Birth | Death | Joined with |
| Wilhelm von Arnsberg | |||
| Jutta von Arnsberg | |||
| Konrad von Arnsberg | |||
| Adelheid von Arnsberg | |||
| Mechthild von Arnsberg | |||
| Piornette von Arnsberg | |||
| Gottfried IV. von Arnsberg (c1295-1371) | 1295 | 21 February 1371 | Anna von Kleve (c1305-1378) |