II
Ivo II de Beaumont-sur-Oise
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Ivo, Count of Beaumont-sur-Oise, founder of the priory of Conflans, was the father-in-law of Hugh de Grandmesnil.
Research notes
IVO II, COUNT OF BEAUMONT-SUR-OISE, founder of the priory of Conflans (Forester's note to Orderic vol.2 p.547; the marriage itself is Orderic's own text ✓); father of Adeliza (our line). ||RESEARCH-FLAG|| OPEN - the Beaumont-sur-Oise counts run 2-3 documented generations higher in French sources; not chased this pass. Added 14 Sep 2026. || FATHER WIRED 14 Sep 2026: IVO I, Count of BEAUMONT-SUR-OISE (ES) - closing the OPEN flag set this morning. FRONTIER-ish above.