Great Moravia - research needed

[Rodion Romanovich]

After a lot of discussion, it has been decided that the new faction will be Great Moravia

But it's not easy to find good info about Great Moravia. Anyone with good links and info to share is welcome to do so in this thread. We need a
- tech tree (buildings will still hold the generic names, but which building levels in the building complexes should they have, and in which levels should the different units be?)
- army list - a. how was the recruitment system divided between militia and core army? b. how was the standard troop type composition in well-known battles fought by Great Moravia? c. ideas for different units, along with appropriate local names
- a short summary on their history, which I can convert into a good faction description for the faction selection screen