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William de Molyneux was the son of Sir Richard de Molyneux, Lord of Sefton, and wife Emma Donne of Utkinton. He was born most likely at Sefton, Lancashire, England, and died in 1289. He is buried at Canterbury Cathedral, Canterbury, Kent, England. He died before his father and so, never received the title Lord of Sefton. The title passed to William's son Richard.
The memorial for Sir William found on www.findagrave.com gives a date of birth of 1210. This is clearly in error, as that is before the birth of either parent. Some sources put his death as 1372, but that is too late, it is after his father's death. As discussed above, he died before his father and never inherited the title.
William married Isabell Scarsbrick, daughter of Henry de Scarsbrick or de Scarisbrick. Two known children - Robert, the heir, who married Agatha and Joan, who married Robert Ernneys - documented in Dugdale's Visitiation of 1664-65.
William was dubbed Knight Banneret in Gascony, by Edmond (surnamed Crookeback), Earl of Lancaster, second son to Henry III, in 14 Edward I [c.1286]. A knight banneret, sometimes known simply as banneret, was a Medieval knight ("a commoner of rank") who led a company of troops during time of war under his own banner (which was square-shaped, in contrast to the tapering standard or the "pennon" flown by the lower-ranking knights) and were eligible to bear supporters in English heraldry.
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1250 |
1250
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Sefton, Lancashire, England (United Kingdom)
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1277 |
1277
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Lancashire, , England
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1285 |
1285
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Sefton, Lancashire, England (United Kingdom)
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1289 |
1289
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Sefton, Lancashire, England
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1289
Age 39
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Sefton, Lancashire, England (United Kingdom)
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1291 |
1291
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Lancashire, , England
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1293 |
1293
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Sefton, Lancashire, , England
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1310 |
1310
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1934 |
May 19, 1934
Age 39
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