daughter de Lancaster de Kirkeby

The coat of arms of Gilbert fitz Roger fitz Reinfrid, as they appear at Lancaster castle.[1] These are identical to those of his father-in-law's family, the de Lancastre family of Westmorland, and identical arms were also carried by his two sons, and at least one grandson, all of whom used the surname "de Lancaster" also. https://en.wikipedia.org/wiki/Gilbert_fitz_Roger_fitz_Reinfried#/media/File:Arms_by_andrew.jpg