It is a guess that Hawise is his daughter.  The inference is from the fact that her first husband died in 1294, so she must have been married before that, so probably born 1275 plus or minus 10 years.  This requires her father to have married around then and to have been born perhaps 20 years earlier.  All of which ties in best with this Fulk.


TFPL, 2010: Fulk V’s ancestry is confirmed by Janet Meisel in her “Barons of the Welsh Frontier” pub 1980 by University of Nebraska press.  I have yet to see her references and need to reexamine this book (at TNA, Kew in the Map Room).