The House of Clifford is unclear on Lewis. On p.68 he is not shown as a son of Roger, whereas on p.67 and the lineage on p.xiv he is mentioned.
This is discussed extensively on pp120-124, chapter 28.
«b»Brian Tomsett of Hull England has him with two sets of parents and has birth dates -- 1336 and 1357. Two URLs above. Tutorplace I have given him both parents. «/b»
[S36] Brian Tompsett, Dept of Computer Science, University of Hull, England(B.C.Tompsett@dcs.hull.ac.uk), Directory of Royal Genealogical Data, (This work is Copyright b 1994-2002 Brian C Tompsett).