You havnt grown them very well for that much happiness though, no where near enough farms, Nicea still has unfarmed bare riverside tiles!
Farm, farm, farm, Granaries and Watermills asap, work food and keep growing growing growing while building library / colosseum / garden, and marketplaces when you need them. Short on cash? Sell all your luxuries, you will hardly need them.
Theres also one more really nice city site there east of Antioch, no need to stop at 4, 5-6 cities is easily doable with those beliefs, but you need to grow them faster.
By 1600 AD I would have 4 size 20 cities at least.
Danke, I'll keep that in mind for next game or two. I guess I was too focused on running my Unis and maintaining production, and in hindsight, with the incredible amount of peace I got from the start, I should have sold off more luxes too.