From Alathra Wiki

Hatay is a city discovered by the great philosophist emirzorlu and the historian meeting the 2 had large ambitions when starting the town but at the time they did not know they were settling into claimed territory when they realized they're in ashina territory emirzorlu quickly tried to contact the ashina rulers to resolve the issue politically when he sat down and talked with the king of ashina they decided it would be beneficial to both parties if Hatay joined ashina and that's how Hatay became a part of ashina