Baldwin may not belong here. They are not shown some places such as Wikipedia, but Brian Tompsett of the University of Hull; Hull, England, has him as the father of Hugh in his work Royal Genealogical. Jamie Allen in her work Fabulous Pedigree shows both ways. With him in and with him out as possibilities. When Jamie leaves Baldwin out she puts in Manasses II Count de Rethel died 1056 to take Baldwin's place to fill the gap. Neither Baldwin or Manasses that died in 1056 are mentioned in the list of Counts of Rathel.
[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).
[S1728] Wikipedia-The Free Encyclopedia, (http://en.wikipedia.org/wiki/Main_Page
the free encyclopedia).