Al-Mu'tasim sends Invasion Fleet
Devecitasi Ada Island, AntalyaAt the time of his death in 842, al-Mu'tasim was preparing yet another large-scale invasion, but the great fleet he had prepared to assault Constantinople was destroyed in a storm off Cape Chelidonia a few months later. Following al-Mu'tasim's death, warfare gradually died down, and the Battle of Mauropotamos in 844 was the last major Arab–Byzantine engagement for a decade.