Wasn't the Papacy still a relatively large land holder and military power?
Seljuks are extremely late in the period, but could be interesting.
Slavs are a good idea. Would just a general Slav people be too close to existing factions? If so, Western Slavs as a general term, or Great Morania could maybe be used.
http://en.wikipedia.org/wiki/Slavic_peoples
The Polabians, specifically the Rojane from modern Rügen, would be an interesting choise because they were conquered by Denmark right after the period, but these could really just be represented by rebels.
Other possibilities:
Kingdom of Pamplona (like Asturia with bandit troops and less cavalry)
Basque Rebels (like Ostrogoths or Roman Rebels for whatever faction holds #13, #14 and #2. Bandit troops)
County of Catalunya (mix of Franks and Asturia)
I seem to have grown Hispano-centric. Who, besides Abbasids and al-Andalus, had power in North Africa?
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