Index: Of Age Of Empires 4 ((free))

In 90% of cases, this specific search string is used by someone looking to download the game without paying for it.

The Ultimate Index of Age of Empires IV: Your Definitive Guide to the Medieval Battlefield index of age of empires 4

Centered around the "House of Wisdom," allowing for non-linear tech upgrades. In 90% of cases, this specific search string

Relic Entertainment Publisher: Microsoft In 90% of cases

Ayyubids, Jeanne d'Arc, Order of the Dragon, Zhu Xi's Legacy, and others (specialized versions of base factions). Age of Empires IV Multiplayer Gameplay Impressions

If you meant a you saw online, do not trust it unless it's from ageofempires.com or a known modding community. Always prioritize official or widely trusted community sources.