Got it Quillan, thanks! Yes, Halicarnassus had a plague in the picture

Corinthio has less population than Athens, but I think the matter is that Athens is the capital of my empire, so maybe that's why Athens earns the most money.

Another strange event has happen... Byzantium gives me the same money as Athens now!... It suddenly grew up from 2800 denarii per turn to 6500 denarii!

The same happened me with Carthage, Tapsus and whole Sicilia... They were giving me losses and now they all give me more than 3000 denarii per turn!

Severous, I have 3 famous battles markers in the sea, all of them in Aegean Sea. I think my boats' golden weapons, armours and chevrons helped to make an epic victory (In spanish it is "Victoria Épica", the biggest type of victory, I don't remember how is it en English... "Crushing Victory"?) and that's why I got it, I made Crushing Victories at sea...

I wish there are playable naval battles in next games...