Sleight, good topic!
Although I like your initiative, I'd like to draw your attention to some other "saxon issues" in this game. Maybe this is important to you too, as you seem to have interest in the historically correct representation of saxons ingame. So maybe you adress these things too in your thread, you seem to be good in these things, much better than me.
I'd like if PI corrected that miserable culture mis-naming for saxons/anglo-saxons. Saxons have to be in north germany, period. Anglo-saxons (as the followers of hengist/horsa were angles, saxons, jutes and frisians) should be the culture set in England. This is an issue that drives me mad...
E.g. Heinrich I wasn't a german, he was saxon, he spoke saxon, was duke of saxony, still ingame his culture is german. Same for Otto I (even for him very debatable to call him a german btw.), etc. pp.
Also, they misplaced the duchy of saxony, which should be where ingame is the duchy of brunswick-lüneburg. It was only after 1180 that the Askanians (the rulers of Meissen, formerly Angria) aquired the saxon title.
And other placing issues with Magdeburg, not only in Otto's dukal time a very important city, one of the most advanced and prosperous, is a bishopric ingame, why on earth? Even worse, it is placed in region that belogs to the kingdom of pomerania, isn't this a bit absurd?
For the love of (the) god(s), help getting the devs' attention to this.

Sorry for the hijacking. :S
Regarding your topic, it would be interesting if PI added characters that were back in the very early days, like the early kings of the anglo-saxons. Is Aethelbert I in the game? Charlemagne is ingame, okay, but from what I've seen the history ingame doesn't go back far for many other, less "important" regions. It is quite tedious clicking through all those menus to find out who held what where and when. Is there an easier way maybe?