Strongbow Fitzgilbert

[Ludens]

I suppose the name is fixed, but the unit he´s assigned to is random.
Is there somewhere more info about the historic personalities you can get? Like, when and where can they appear, and perhaps some background infos?

Indeed. Strongbow FitzGilbert is one of the many historical heroes M:TW includes. They appear at a set date (16 years after their birth date) when you construct a unit. I know of two heroes listings: Ky Kiske's heroes list (M:TW only) and Nefarious' M:TW info pack (contains the heroes, provinces and GA of M:TW & VI, but does not tell you what the heroes stats are). You can find Nefarious e-mail adress in Froggy's M:TW beginner's guide, AFAIK it cannot be found anywhere on the internet. For background info you might try wikipedia.

It could be that MAA are more likly to be a general than spears (Like pesants aren't usualy generals) but I could be wrong.

You are right, but the general appears in whatever unit is finished on the turn of his appearance. If multiple units are build, he pick the unit that is "preffered" for generals by the unit files.