Advance to Age II

Culture Wing

Abbasid Dynasty
The following cultural technologies become available: • Preservation of Knowledge (Age II) • Medical Centers (Age III) • Public Libraries (Age IV)
Available in the Dark Age (I)

Researched at

House of Wisdom

Patch History

Patch 6.1.130

Preservation of Knowledge cost reduced from 50 wood 125 gold to 25 wood 75 gold

Season Four Update

Preservation of Knowledge research time reduced from 60 to 30 seconds

Preservation of Knowledge now applies to age up costs

Preservation of Knowledge bonus reduced from 30% to 20%

'Faith' renamed to Proselytization which unlocks the 'Proselytize' ability.

Costs
400
200
1:45

Age of Empires IV© Microsoft Corporation. AoE4World.com was created under Microsoft's "Game Content Usage Rules" using assets from Age of Empires IV , and it is not endorsed by or affiliated with Microsoft.