SOURCE-17898Research NeededProbable
Constance Mary Butler & John Henry Bernard (editors), The Charters of the Abbey ...
Full citation
Constance Mary Butler & John Henry Bernard (editors), The Charters of the Abbey of Duiske (Dublin, 1918), p.21: https://archive.org/details/chartersofabbeyo00butl/page/20/mode/2up?q=philip