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Fulgrim

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As for me best option is something like "Imperial Capital" with St. Sophia Cathedral, grand circus, imperial palace, great cistern and other ones wonders as improvements.
There are too many wonders to chouse one)
 

knppel

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If you want a tactical choice, it depends a lot on your playstyle and how you manage the realm.

I.e. if you hold the cities too, you do want something that boosts income, trade and wealth.
If you aim to be the leading scientific world power, university of course.
If you mostly use Constantinople as Capital and don't hold sub-baronies, the palace granting bonuses to general realm management options opposed to local income sounds useful.
If you reform with Bloodthirsty gods, you want a collisseum.

etc.
 

AlexArgos

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Grand Cathedral, obviously.
I'm thinking of building a Grand Cathedral in Sicily on the site of my ancestor saint's tomb. And I would prefer something to boost the defenses of Jerusalem (for RP reasons only, it's been safe for decades) but I guess a Great Citadel can be built anywhere in the Middle East.

So my question would become more general: what is the difference between the Citadel and the Walls? From the initial bonus and list of upgrades, they seem practically identical to me. :confused: