 Complete the following phrase:  The theme continued in existence until the dissolution of the Byzantine Empire by the Fourth Crusade 1204, when it became part of the short-lived Latin Kingdom of Thessalonica. In 1246, after the Nicaean emperor John III Vatatzes r. 12211254 conquered Macedonia, the theme was re-established as a separate province. In the 14th century, however, it again appears as combined with other provinces such as the themes of Boleron and Thessalonica or as the theme of Serres and Strymon. It was permanently dissolved after the regions conquest by the Serbian Empire in the 1340s, during a Byzantine 