Genghis.Khan
Person
Abou the civs I think you might add those
The Kingdom of Israel
Leader: Solomon/David
Trait: Yeretz Israel: +1
per turn. +0.5
per New Populations in Cities
UU: Haganah (Replaces WW Infantary) Bonus in friendly lands (15%) and against civilizations with other religion (20%).
UB: Synagogue (Replaces Temple). +2
and +1 
Mali
Leader: Mansa Musa
Trait: Something
related (e.g. +2
per
+1
per desert tiles
UC1
UC2
The Kingdom of Israel
Leader: Solomon/David
Trait: Yeretz Israel: +1
per turn. +0.5
per New Populations in CitiesUU: Haganah (Replaces WW Infantary) Bonus in friendly lands (15%) and against civilizations with other religion (20%).
UB: Synagogue (Replaces Temple). +2
and +1 
Mali
Leader: Mansa Musa
Trait: Something
related (e.g. +2
per
+1
per desert tilesUC1
UC2
. Besides, even though the Polish Hussar was different from the general light cavalry model of hussars, it is already a UU for Austria now. And enough civs have mounted replacements to have another civ with two of them.
(unless asked). As a Garden replacement with slightly reduced (say 20%) GP production, to temper the UA a bit, it would make sense. Gold on food resources, defined as "any resource, bonus or luxury, that adds food either as base or improved yield", would also boost salt. And that's just fun for immersion if it happens to be in your empire, considering its importance for Poland
.

Yeah, it's not the first time I mistaken it...
12 maybe? - plus cover) and be a swordsman-bowman universal soldier; but they will require too many techs in this case. Maybe swap techs for them and towers? so towers will be available with constructions (what makes scence) and archers with iron working. about a special ability for the tower, what way should it reduce walls bonus? maybe, it should damage an adjacent city just how a citadel damages enemy units, on per-turn basis.