Roger/ Rutger de Flor (von Blum) - my relative Roger

my 22nd great grand father...his story is just amazing

He's in GURPS Who's Who 2, pages 38-39. It's mostly true but it's not the whole story. The outlines of that are here: http://en.wikipedia.org/wiki/Catalan_Company

There's a song, "Catalan Vengeance", which is Loosely Based on the True Story: http://www.calonsong.org/CalontirSongs/catalanvengeance.htm

Note: there is some back-influence from Gordon R. Dickson's "Ballad of Jacques Chretien" (a science-fiction filksong) - de Flor was assassinated, not hanged.