How is his relationship as the son of Guy IV Laval established?
Most listings show only two children of Guy IV Laval,: Guy V Laval and a daughter, Cecile de Laval.
other listing have Guy IV de La Roche Guyon as the son of Guy III de La Roche Guyon
Hello John, thanks for bringing this up. When I look at it, there are obviously a number of wrong connections there (and duplicates that need to be merged. I can make the changes (the French sources are pretty clear about who was who around this family) - but perhaps you'd like to have a go at it?
I am completely new to this. I did not mean to suggest that I knew something better. It will be quite a while before I can make any thoughtful contributions to your body of work.
Thank you for the quick reply to my inquiry.