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In page Sardis:

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Sardis began to decline in the 600s AD.[1](p1123) It remained part of the Byzantine Empire until 1078 AD, by the Seljuk Turks. It was reconquered in 1097 by the Byzantine general John Doukas and came under the rule of the Byzantine Empire of Nicaea when Constantinople was taken by the Venetians and crusaders in 1204. However, once the Byzantines retook Constantinople in 1261, Sardis and surrounding areas fell under the control of Ghazw emirs. The Cayster valleys and a fort on the citadel of Sardis were handed over to them by treaty in 1306. The city continued its decline until its capture and probable destruction by the Turco-Mongol warlord Timur in 1402.[citation needed]