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. Notable ancestors include Charlemagne (747-814), Alfred the Great (849-899), William I of England (1027-1087), Hugh Capet (c940-996), Rurik (c832-879). Ancestors are from France, the United Kingdom, Germany, Belgium, the Netherlands, Russia, Ukraine, Italy, Turkey, the Byzantine Empire.


Offspring of Wilhelm I. von Jülich and Joanna of Hainaut (c1307-1374)
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)
Wilhelm I. von Jülich (c1299-1361)
Born: c.  1299 Died: 25/26 February 1361
Preceded by
Gerhard V
Count of Jülich
Duke of Jülich
(since 1356)

Succeeded by
William II

Namesakes of Wilhelm I. von Jülich (c1299-1361)

 Birth placeDeath placeFatherMotherJoined with
Wilhelm III. von Jülich (-1218)Eberhard II von Hengebach (-aft1217)Jutta von Jülich (-aft1190)Mathilde van Limburg (c1190-bef1237)
Wilhelm II. von Jülich (c1325-1393)Wilhelm I. von Jülich (c1299-1361)Joanna of Hainaut (c1307-1374)Maria van Gelre (c1328-1397)
Wilhelm I. von Jülich (c1299-1361)Gerhard V. von Jülich (bef1250-1328)Elisabeth van Aerschot (?-1350)Joanna of Hainaut (c1307-1374)
Wilhelm IV. von Jülich (1210-1278)AachenWilhelm III. von Jülich (-1218)Mathilde van Limburg (c1190-bef1237)Margaretha van Gelre (?-?)
Wilhelm III. von Jülich (1364-1402)Arnhem, NetherlandsWilhelm II. von Jülich (c1325-1393)Maria van Gelre (c1328-1397)Katharina von Bayern (1360-1402)

Common ancestors of Wilhelm I. von Jülich (c1299-1361) and Joanna of Hainaut (c1307-1374)

  1. Hendrik I van Brabant (1165-1235)
  2. Hendrik III van Limburg (1140-1221)
  3. Mathilde de Boulogne (c1163-c1211)
  4. Sophie von Saarbrücken (c1150-aft1214)
  5. Walram IV van Limburg (c1168-1226)

Footnotes (including sources)

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