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Wilhelm I. von Jülich, Count of Jülich, Duke of Jülich, Earl of Cambridge, was born circa 1299 to Gerhard V. von Jülich (bef1250-1328) and Elisabeth van Aerschot (?-1350) and died 26 February 1361 of unspecified causes. He married Joanna of Hainaut (c1307-1374) 1313 JL in Cologne, Germany.
Children
| Name | Birth | Death | Joined with |
| Richardis von Jülich (1314-1360) | |||
| Gerhard VI. von Berg (?-1360) | 18 May 1360 | Margarete von Ravensberg-Berg (c1320-1389) | |
| Philippa von Jülich (1328-1390) | 1328 | 1390 | Gottfried von Heinsberg (1325-1395) |
| Johanna von Jülich (1330-1359) | 1359 | Wilhelm I. von Isenburg-Wied (-1383) | |
| Wilhelm II. von Jülich (c1325-1393) | 1327 | 13 December 1393 | Maria van Gelre (c1328-1397) |
| Elisabeth von Jülich (?-1411) | 1335 | 6 June 1411 | John Plantagenet, 3rd Earl of Kent (1330-1352) Eustache d'Aubrécicourt (-aft1371) |
Wilhelm I. von Jülich (c1299-1361) House of Jülich Born: c. 1299 Died: 25/26 February 1361
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| Preceded by Gerhard V |
Count of Jülich Duke of Jülich (since 1356) 1328–1361 |
Succeeded by William II |
Footnotes (including sources)
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