English: Sagalassians BC. He is from the Pisidian people, a branch of the Luwian tribes living in Western and Southern Anatolia at the end of the 3rd millennium BC. B.C. Alexander the Great captured this city in 333 BC. Sagalassos entered the dominions of Seleucid (Seleukos) and Attalid (Attalos), BC. In 25 BC, it was annexed to the territory of the Roman Empire by Amyntas, the king of Galatia, and then by Augustus. The much larger economic growth, which started when Hadrian chose Sagalassos as the official center of the Pisidian imperial cult in the 120s, initiated a century of development growth. The city continued to develop until the middle of the 6th century AD. It was destroyed in the great earthquake in 590. M.S. A few small villages continued to survive among the ruins of the city until the Seljuks destroyed the last Byzantine castles in the middle of the 13th century.