Red and Blue: Empire of Nicea mid 13th century. Blue: Imperial city state 15th century.

The 13th century may have been a beginning of Byzantine expansion, but the empire begun to lose territory, by the later 14th and 15th century, it was more like a city state then an empire.

The empire at this time ruled southern Greece, some islands in the Aegan sea, land surrounding Adrianople, and Constantinople.