Byzantines

Defensive civ, Heavy units.
Time period focus: 9th-15th century
Primary resource: Gold

Holy Roman Empire

Defensive civ, Heavy units, Duchies.
Time period focus: 10th-15th century
Primary resource: Gold

Mongols

Aggressive civ, Cavalry Archers, Siege
Time period focus: 13th-14th century
Primary resource: Food & Gold

Norsemen

Aggressive civ, Infantry, Navy, Economy
Time period focus: 8th-11th century
Primary resource: bit of everything

Ottomans

Aggressive civ, Gunpowder, Cavalry
Time period focus: 14th-15th century
Primary resource: Gold

Scots

Defensive civ, Spearmen, Guerilla Tactics.
Time period focus: 13th-14th century
Primary resource: Food, Wood