Thompson then examined the seven references mentioned by Chappell, noting that the one unambiguous reference to Mrs. Katherin Tregian could have been either to the younger Tregian's grandmother or aunt. Noting that the reference itself could be a dedication, Thompson noted that a number of works in the Fitzwilliam Virginal Book are dedicated to various people, none known to be connected with the Tregian family. The presence of two instances of the marking "Treg" in titles as well as ambiguous abbreviations—and noting that all these annotations are missing in other manuscript versions of these works—leads Thompson to find a slim basis for Squire's declaration of Tregian being the copyist in 1899, and no surprise that he later retreated from the claim.