William Gorm de Lacy

http://fmg.ac/Projects/MedLands/IRELAND.htm#WilliamLacyMdauLlywelyn

9. WILLIAM de Lacy (-killed in battle Monach-cranncain 1233). King John ordered the delivery of "William de Lascy to Walter de Lascy his brother…" after he gave assurances about his loyalty, dated 10 Feb 1215[861]. King Henry III commanded "William de Lacy" to deliver "the castles of Rath and Carlingeford which he had taken" dated [Jan] 1217[862]. A report from William Marshall Earl of Pembroke to Henry III King of England, dated 5 Aug 1224, records that he besieged "the castle of Trum…with William de Lascy its lord…conquered him and he with difficulty escaped, he had a brother killed there…[and] the castle was abandoned"[863]. The Annals of Ulster record in 1233 that "William de Lacy and Charles, son of Cathal Ua Conchobuir and many foreigners were killed by the Muinnter-Raighillaigh in Monach-cranncain”[864]. m GWENLLIAN of Wales, illegitimate daughter of LLYWELYN "Fawr/the Great" Prince of Wales & his mistress --- (-1281). In his report to King Henry dated 5 Aug 1224 following the capture of castle Trum, William Marshall Earl of Pembroke records that "the wife of William de Lascy, the daughter of Llewllyn, Griffin´s sister, the wife of Thomas Blund, William´s brother, and the mother of William, of Thomas, and of him that was killed" were in the castle[865].

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See papers by E. G. Lloyd on "Who was Gwenllian de Lacy?" in Arch. Cambrensis (July, 1919):

"William 'Gorm'" married this daughter of Llewellyn the Great but left no issue by her.

Also see "A history of Medieval Ireland from 1086 to 1513" by Edmund Curtis, p. 135:

"The annals of Ulster record in 1233 the death of William de Lacy. His welsh wife Gwenllian survived him and returned to Wales, but they left no issue".

https://en.wikipedia.org/wiki/Llewelyn_the_Great

Issue

Dafydd ap Llywelyn

Gruffydd ap Llywelyn

Elen ferch Llywelyn

Gwladus Ddu

Marared ferch Llywelyn

===== Gwenllian ferch Llywelyn======

Angharad ferch Llywelyn

Susanna ferch Llywelyn

According to represented data "William 'Gorm'" and Gwenllian, daughter of Llewellyn, had no mutual clildren. This is fact from independent sources.

But at the same time we have other version, record in "The Legacy of the de Lacy, Lacey, Lacy Family 1066-1994", p. 56:

"He did miss his association with his half-brother William de Lacy. William

married the elder sister!!! of Llewellyn,

the rebellious Prince of Wales, and William's activities absorbed in Leinster and Limerick...

William married Gwenllian or Gwendoline, or Winnefred as she variously called.

Gwellian was sister!!! to Llewellyn, the paramount Prince of Wales,

who kept wales in open rebellion to British rule for two generations".

Last version is also based upon:

De Lacy-Bellingari, Edward de Lacy-Harnett, The roll of the house of Lacy : pedigrees, military memoirs and synoptical history of the ancient and illustrious family of De Lacy from the earliest times, in all its branches, to the present day.