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Wilhelm Longsword of Winchester Welf von Braunschweig-Lüneburg was born 11 April 1184 in Winchester to Heinrich der Löwe (c1130-1195) and Matilda of England (1156-1189) and died 13 December 1213 of unspecified causes. He married Helen of Denmark (c1174-1233) 1202 JL . Notable ancestors include Henry II of England (1133-1189), William I of England (1027-1087), Charlemagne (747-814), Hugh Capet (c940-996), Alfred the Great (849-899). Ancestors are from France, the United Kingdom, Germany, Belgium, the Netherlands, Russia, Ukraine.
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Offspring of Wilhelm von Braunschweig-Lüneburg and Helen of Denmark (c1174-1233)
Name Birth Death Joined with
Otto von Braunschweig-Lüneburg (c1204-1252) 1204 9 June 1252 Lüneburg, Lower Saxony, Germany Mechthild von Brandenburg (c1210-1261)

Namesakes of Wilhelm von Braunschweig-Lüneburg (1184-1213)

 Birth placeDeath placeFatherMotherJoined with
Wilhelm von Braunschweig-Lüneburg (1184-1213)WinchesterHeinrich der Löwe (c1130-1195)Matilda of England (1156-1189)Helen of Denmark (c1174-1233)
Wilhelm von Braunschweig-Lüneburg (1535-1592)CelleErnst I. von Braunschweig-Lüneburg (1497-1546)Sophie von Mecklenburg-Schwerin (1508-1541)Dorothea of Denmark (1546-1617)
Wilhelm II. von Braunschweig-Wolfenbüttel (c1425-1503)Hardegsen, Lower Saxony, GermanyWilhelm I. von Braunschweig-Wolfenbüttel (1392-1482)Cäcilie von Brandenburg (c1407-1449)Elisabeth zu Stolberg-Wernigerode (-c1520)
Wilhelm I. von Braunschweig-Wolfenbüttel (1392-1482)BraunschweigHeinrich I. der Milde von Braunschweig-Lüneburg (c1365-1416)Sophie von Pommern (c1365-1406)Cäcilie von Brandenburg (c1407-1449) + Mathilde von Schauenburg (?-1468)
Wilhelm II. von Braunschweig-Lüneburg (c1300-1369)Otto II. von Braunschweig-Lüneburg (c1266-1330)Mechthild von Wittelsbach (1275-1319)Hedwig von Ravensberg (-aft1387) + Marie + Sophie von Anhalt-Bernburg (-1362) + Agnes von Sachsen-Lauenburg (1353-1387)

Footnotes (including sources)

‡ General