[@Lucidnonsense] Think of the North like vikings, Sourthern reaches being more Greek-Britannia. The largest city would be... a tie between several. Though the delta city of Havanna would be largest spread out. Mostly farm land and something with a twist of Egyptian royalty in it. Though its still grass, and riverland. Probably over 500,000. Not as large as Athens.

Leather armour is generally what you would think. Cloth armor would be robes, padding, ect. Technology would be greek level. Perhaps a little roman. Though they know higher level smithing for swords and such.