She is married to Thomas 1st Baron de Multon.
They got married on January 3, 1296/1297 at St Peter's Priory, Ipswich, Suffolk, England.Sources 1, 3, 4
Child(ren):
He [Thomas de Multon] married, 3 January 1297, in St. Peter's Priory,Ipswich, in the King's presence, Eleanor, 1st daughter of Richard (DEBURGH), EARL OF ULSTER. [Complete Peerage IX:403-4, (transcribed by DaveUtzinger)]
---------------------------
Eleanor de Burgh; m. 3 Jan 1297 Thomas de Multon, b. 21 Feb 1276, d. bef.8 Feb 1321/2, Lord Multon. [Magna Charta Sureties]
Note: Eleanor's mother is apparently not Margaret de Burgh, as Ioriginally had, but Margaret de Guines, according to Ancestral Roots,lines 94a-31 & 75-31.
Alianore de Burgh
3 Jan 1297