Research Notes:
The Visitation of Yorkshire states that "Sir Thomas Fytzwilliams Knight of Emley and Sprotboroo" married "Agnes doughter of Roger Bertram Lord of Myrford.." and that they were the parents of Sir Roger Fytz William. [1]
[1] William Flower, The Visitation of Yorkshire in the years 1563 and 1564 (London: 1881), 27, of 27-30, Bosbyle pedigree, [InternetArchive].