The last few days I was thinking of the proposed "financial victory" that might be implemented to help civs win if they fail the historical one, or to add some more challenges to the human player.
What it came to mind, is that we can add 4-5 financial victory conditions (instead of making a unique one for each civ) , each for every type of culture available. Maybe more
for example
European civs (Rome, Greeks, Celts etc)
1st condition: ensure there are no barbarian cities below the Danube and the Rhine rivers at 500 AD (date can be adjusted to fit ancient and medieval civs)
2nd condition: be the richest civ by 700 AD (again, date is adjustable)
3rd condition : trade with 5 civs and don't participate in any war for 200 years (pax romana )
Middle eastern and central Asian civs (Kushans, Sassanids, Parthia, Tocharians etc)
1st condition: Build a road from Samarqand to Gu'zan and control every province this road crosses
2nd condition: Have trade with at least 3 chinese and 2 other civs from Europe or Africa at the same time
3rd condition: Accumulate 15000 gold from trading, caravans, merchant ships, great Merchants by 600 AD
and so on!