Philadelphia was an independent, neutral city under the influence of the Latin Knights of Rhodes, when taken in 1390 by Sultan Bayezid I and an auxiliary Christian force under the Byzantine emperor Manuel II after a prolonged resistance, by which time all the other cities of Asia Minor had surrendered to the Ottomans. Manuel had been forced by Bayezid to participate in subjugating Philadelphia to Turkish rule, a bitter irony given its long resistance. Twelve years later it was captured by Timur, who built a wall with the corpses of his prisoners.