Lady Rose de Lacy

Alan married his last wife, (3) Rohese de Lacy, in 1229, the daughter of Hugh de Lacy, 1st Earl of Ulster.

By one of his marriages he had a son, Thomas, who predeceased his father; (not to be confused with his illegitimate half-brother, also named Thomas).

http://en.wikipedia.org/wiki/Alan,_Lord_of_Galloway

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

Hugh [& his first wife] had two children:

a) HUGH de Lacy (-after 1226). m ---. The name of Hugh´s wife is not known. Hugh & his wife had two children:

i) WALTER de Lacy . A charter dated [12 May 1226] records that Walter de Lacy took the property of Hugh de Lacy, as ordered by the king, and that "Walter and Roger, sons of Hugh de Lascy, Hugh´s eldest son" were given as hostages[845].

ii) ROGER de Lacy . A charter dated [12 May 1226] records that Walter de Lacy took the property of Hugh de Lacy, as ordered by the king, and that "Walter and Roger, sons of Hugh de Lascy, Hugh´s eldest son" were given as hostages[846].

b) ROSE de Lacy (-after 1237). Henry III King of England noted that "Waltero de Lascy" had given "Roesiam neptem eius, filiam Hugonis de Lascy" as a hostage, dated 28 Mar 1217[847]. According to Matthew of Paris, the wife of Alan of Galloway "iam defunctus" was the (unnamed) daughter of "Hugonem de Lasey"[848]. The Chronicle of Lanercost records in 1229 that "Alan the lord of Galloway…set out for Ireland and there married the daughter of Hugh de Lacy"[849]. John of Fordun´s Scotichronicon (Continuator) records that "Alanus de Galweia profectus in Hiberniam" married "filiam Hugonis de Lacy" in 1228[850]. If her parentage and marriage is correctly stated in the two sources quoted, the chronology suggests that this daughter must have been born from Hugh´s first marriage, assuming that she was legitimate. She is named "Rose de Lacy" by Keith Stringer, who cites a charter of St Bees which indicates that she was still alive in 1237[851]. m ([1228/29]%29 as his [fifth wife], ALAN Lord of Galloway, son of ROLAND Lord of Galloway & his wife Elena de Moreville (-[2] Feb 1234, bur Dundraynan).