'Erzeroum', 1890. Erzurum city in eastern Anatolia, in 387 AD, the city passed into the hands of the Romans who called it Theodosiopolis, then conquered by the Umayyad general Abdallah ibn Abd al-Malik in 700/701. From "Cassell's Illustrated Universal History, Vol. III - The Middle Ages", by Edmund Ollier. [Cassell and Company, Limited, London, Paris and Melbourne, 1890. ]