Sir Thomas De Verdon, of Clonmore - Sources needed

Anne Brannen - can you point us to good sources for this area?

All we’ve got so far is:

Sir Thomas Verdon of Clonmore (died 1375), head of the dominant Anglo-Norman family in County Louth and his wife Joan Hartort. Matilda's first husband was Peter Howth.[1]

Her father was a grand-nephew of Theobald de Verdun, 2nd Baron Verdun (died 1316).[1]

Also, wouldn’t this already be on geni somewhere?