Mill'En'Air is a Medieval Age modpack with Millenaire, a mod that features different ancient civilizations and ancient people and how they went about their daily lives.
There are about 6-8 different civilizations in the base mod, and there are additional ones added in the Al-Andulus mod.
There also is the JEI addon for Millenaire to help find what each type of village will trade with the player and what can be sold.
Additionally, there is the Realistic Horse Genetics mod that lets the player breed speed, jumping, and the color of the horse together in one package.
Furthermore, there's Horse Carts, Horse Power, Horse Tack, Horse Barding, and Craft Saddles and Horse Armor that add additional pieces to craft for your horses.
Epic Knights, Shields, and Armor has been added to provide Medieval Age weapons and armor for the player.
Lastly, Electroblob's Wizardry has been added along with many of the addons available for the mod like Extra Golems, Arcane Essentials, and Wizardry Golems.