'Section of Route from Diarbekir to Sivas and Sivas to Sinope by Aneroid readings', c1915. Map showing the journeys, with altitude above sea level, of British writer, soldier and diplomatic advisor Mark Sykes in Turkey (at that time part of the Ottoman Empire), between 1905 and 1913. Sykes (1879-1919) travelled through Palestine, Iraq, Syria, Persia and Turkey, was honorary attach? to the British Embassy in Constantinople 1905-1906, was elected to parliament, worked in the Intelligence department of the War Office during the First World War, and died of the Spanish flu aged 39. From "The Caliphs' Last Heritage, a short history of the Turkish Empire" by Lt.-Col. Sir Mark Sykes. [Macmillan & Co, London, 1915]