Bleobaris was the first true Exarch of the Crusader States.  His line continued on past his death, but not past the 2nd generation.  There was one instrumental retainer as well.
Maradoc, 1st Wizard of the States

Sir Bradley, then Exarch Bradley’s rise to power is a fact.  The details of that time period are a bit shady and more information tends to surface as the years go by. The line is in its 4th generation should the youngest boy reach adulthood.
Sir Beau served multiple generations in many capacities.