1158-1163 William le Vavasour was a "witness to a charter c 1158-63." [1]
1188 Sir William Vavasor, of Hazlewood, was a Justice itinerant in 34 Henry II [19 December 1187-18 December 1188]. [2] [3]
1189-1191 William le Vavasour died "after Michaelmas 1189 but before 29 June 1191." [4]
[1] Charles Mosley, ed., Burke's Peerage, Baronetage, & Knightage, 107th edition, Vol. 3 (Willington, Delaware: Burke's Peerage & Gentry, LLC, 2003), 3984.
[2] J.W. Clay, ed., Dugdale's Visitation of Yorkshire, with Additions, Vol. 2 (Exeter: William Pollard & Co., 1907), 224, [InternetArchive].
[3] J. W. Clay, "Dugdale's Visitation of Yorkshire, with additions," The Genealogist a Quarterly Magazine of Genealogical, Antiquarian, Topographical, and Heraldic Research, New Series, 19 (1903), 36, 112, 190, 248, at 112, [HathiTrust].
[4] Charles Mosley, ed., Burke's Peerage, Baronetage, & Knightage, 107th edition, Vol. 3 (Willington, Delaware: Burke's Peerage & Gentry, LLC, 2003), 3984.