Historical changes I would make

While I love AoE2, there are a few historical-based changes here and there I would make to give some of the civs a bit more life and accuracy. Now, most of these are smaller-scale and don't involve things that have never happened (like changing civ names) as things like that open a can of worms. So this is just adding units, or changing architecture. Anyway, this is mostly for fun, and me getting some brainstorming onto paper.

Indians - Give access to Battle Elephants
India is well known for its elephants, and it seems odd that this civ only uses them as chonky cavalry archers.

Mongols & Huns - Create new architecture set based on the yurt design
The Hun architecture makes very little sense, and the Mongol one only works in the context of the Yuan Dynasty.

Vikings - Create new architecture set for them based on their Wonder design
The Central-European set only sorta works during the Feudal age, then it looks very out of place. It's even more egregious when they build their Wonder.

Sicilians - Give access to the camel-line
A big deal was made over them being a cultural mix, yet that wasn't very evident in their tech tree. Also Sicilians used to raise horses with camels to get them used to the smell, so they clearly had access to them.

Turks - Give access to the Steppe Lancer
Seems odd that a (even partially) steppe nomad civ does not have access to this unit.

Huns - Give access to the Steppe Lancer
Similar reason to the previous point. Probably a horrific idea balance-wise haha.

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Huns - Remove Atheism tech and replace with...anything else
The Huns were not an atheist people. Plus the tech is really weird.

Saracens - Change the Mameluke to a horse-type cavalry unit
It's not even the right kind of camel. Seriously, this thing is just bizarre.

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Persians - Change to Central-Asian architecture
Been covered multiple times as to why.

Persians - Add a unique further stage for the Cavalry Archer line with more defense
Parthians and Persians were well-known for cavalry archers, but isn't reflected in-game with any bonuses or even fully-upgraded Cavalry Archers. An upgrade with a lot of armour would reflect their cavalry archers better.

Lastly; Turks, Malians, Persians, Saracens, Berbers, Indians, Tatars all use the Imam skin for their monks. And Chinese, Japanese, Koreans, Mongols, Vietnamese, Malay, Khmer, Burmese use the East-Asian Monk skin.
Different skins for Monks are possible (Mesoamericans), and these two are already in-game. Seems like a waste to not use them.