Mahaut II of Boulogne, married his captor's younger
son, Philip Hurepel, and afterwards Ferdinand's nephew
Alphonse of Portugal ?
http://en.wikipedia.org/wiki/Matilda_II_of_Boulogne
Genealogically, Renaud appears of very little
interest: his any descent did not survive the harsh
century, afaik. No one today lays claim to have him as
direct ancestor.
(I have a distinct recollection that I have asked here
in this list after his grandson's fate, he disappeared
to somewhere in England)
- Oops, I shouldn't have publicly mentioned that no
one claims that descent. Lessee, as soon as some Howe
hears about this, there will be such claim

Amazingly, the article about Renaud in Wikipedia has
the correct year of death:
http://en.wikipedia.org/wiki/Renaud_de_Dammartin
(but how long - as soon as some idiot Wikipedian hears
about ES date, it probably gets added, and then there
will be a pssing contest to find consensus how to
balance between the two different sourced dates)
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