World War British prisoners of war who had been captured at Gallipoli were housed here in an empty Armenian church at the foot of the rock. During the Greco-Turkish War (1919-1922) campaign (part of the Turkish War of Independence) Afyon and the surrounding hills were occupied by Greek forces. However, it was recovered on 27 August 1922, a key moment in the Turkish counter-attack in the Aegean region. After 1923 Afyon became a part of the Republic of Turkey. The region was a major producer of raw opium (hence the name Afyon) until the late 1960s when under international pressure, from the US in particular, the fields were burnt and production ceased. Now poppies are grown under a strict licensing regimen. They do not produce raw opium any more but derive Morphine and other opiates using the poppy straw method of extraction. Afyon was depicted on the reverse of the Turkish 50 lira banknote of 1927–1938. Economy The economy of Afyonkarahisar is based on agriculture, industries and thermal tourism. Especially its agriculture is strongly developed from the fact, a large part of its population living in the countrysides. Which stimulated agricultural activities greatly. Marble Afyonkarahisar produces an important chunk of Turkish processed marbles, it ranks second on processed marble exports and fourth on travertine. Afyon holds an important share of Turkish marble reserves, with some 12,2% of total Turkish reserves. Afyon has unique marble types and colors, which were historically very renown and are unique to Afyon. Like "Afyon white", historically known as "Synnadic white". "Afyon Menekse", historically known as "Pavonazzetto" and "Afyon kaplan postu", this type was not popular. Historically marble from Afyon was generally referred to as "Docimeaen marble". Docimian marble was highly admired and valued for its unique colors and fine grained quality, by ancients such as Romans. When the Romans took control over Docimian quarries, they were blown away about the beautiful color combinations of Docimian Pavonazzetto, which is a type of white marble with purple veins. A trend started about it right away. Emperors Augustus, Trajan, Hadrian, all made extensive use of Docimian marble to all their major building projects. Docimian Pavonazzetto was extensively used in major building projects in the very heart of Rome aka Forum Romanum and all over the empire. Pavonazzetto was used on the most eye catching places such as, columns, wall and floor veneer and wall reliefs. Other marbles from