Caribert de Laon - Record of Alternative Data after Merges

From Genalogics.org:
"Heribert died before 762, as stated in an act of his daughter and son-in-law." - found under 'Notes / Biography' on this page:
http://genealogics.org/getperson.php?personID=I00020920&tree=LEO

BUT - the reference says the Biographical note was drawn from Wikipedia.
A circular reference it seems...

From the Medieval Lands project (fmg.ac) it is clear that he still donated land to an abbey on 23 Jun 720. By 13 Aug 762 his daughter Bertrada donated property to Kloster Prüm, and it is clear that he (Caribert) is no longer alive. http://fmg.ac/Projects/MedLands/FRANKSMaiordomi.htm - see paragraph H 1b Charibert.
Somewhere between 720 and 762 thus seems to be his date of death. Could not trace April 747 anywhere (so far) though.

Thanks Johan, I'm good with us setting it as between those dates>
On his About Me: From the French Wikipedia page on Caribert de Laon:
On ne sait que peu de choses sur le comte Caribert de Laon ou Héribert (né avant l’an 696 - mort en avril 747 [réf. nécessaire]). but no ref.