Genealogy research by Mark Humphrys,
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There was a claim that William de Burgh descends from Robert de Burgo (see here), half-brother of William the Conqueror.
William de Burgh (see here),
Anglo-Norman, born c.1160,
arrived in Ireland 1185 (a few years after the Anglo-Norman invasion of 1169),
said to have mar a dau of Domnall Mor O'Brien, King of Thomond [descendant of Brian Boru],
granted Connacht in 1196, but the Normans did not yet control it on the ground,
made Lord of Connacht,
died winter 1205/1206, age c.45 yrs,
Walter de Burgh, Earl of Ulster, under ULSTER in [Complete Peerage].
Note (f) from the above, on the de Burgh ancestry.
It says William de Burgh is not the same as William FitzAldelm.