Research Notes:
Keats-Rohan states that Arnald de Percy of Kildale, Yorkshire, was a "member of the Percy family of Yorkshire, ancestor of the Percys of Kildale. He attested the charter of Whitby abbey c. 1091-96. Between 1129 and 1135 he gave the church of Ormsby to Guisborough. He left issue Arnald II, Robert, and Hawise, wife of Ralph II de Neville." [1]
[1] K. S. B. Keats-Rohan, Domesday Descendants, A Prosopography of persons occurring in English documents, 1066-1166: II Pipe Rolls to Cartae Baronum (Boydell Press, 2002), 629, citing Clay, Early Yorkshire Charters (1955), XI, no. 1 and Farrer, Early Yorkshire Charters II no. 650.