. ▁The ▁project ▁is ▁supposed ▁to ▁complete ▁in ▁ 2 0 2 1 , ▁and ▁the ▁church ▁will ▁be ▁converted ▁into ▁a ▁library . ▁In ▁the ▁village ▁of ▁Gaz iler ▁there ▁is ▁a ▁ 1 2 th - century ▁Salt uk id ▁castle ▁with ▁a ▁small ▁Ott oman ▁mos que ▁built ▁in ▁ 1 7 8 4 . ▁ ▁Dem ography ▁In ▁the ▁late ▁ 1 9 th ▁century ▁the ▁district ▁of ▁O lt u ▁was ▁mainly ▁Turkish ▁( 6 5 % ▁in ▁ 1 8 9 7 ) ▁while ▁the ▁small ▁town ▁of ▁O lt u ▁was ▁mixed ▁( pred omin antly ▁Armen ian ). ▁The ▁district ▁became ▁part ▁of ▁the ▁Russian ▁Empire ▁in ▁ 1 8 7 8 . ▁The ▁Russian ▁authorities ▁held ▁a ▁census ▁in ▁ 1 8 9 7 ▁showing ▁that ▁the ▁district ▁of ▁O lt u , ▁including ▁the ▁town , ▁had ▁ 3 1 , 5 1 9 ▁inhabitants ▁of ▁whom ▁ 2 0 , 7 1 9 ▁were ▁Tur ks ▁( 6 5 . 7 % ), ▁ 3 , 5 0 5 ▁Kur ds ▁( 1 1 . 1 % ), ▁ 3 , 1 2 5 ▁Armen ians ▁( 9 . 9 % ), ▁ 2 , 7 0 4 ▁Gree ks ▁( 8 . 6 %) ▁and ▁ 1 , 0 3 8 ▁Rus si ans ▁( 3 . 3 %). ▁ ▁Geography ▁O lt u ▁is ▁situated ▁in ▁the ▁O lt u ▁Brook ▁Valley , ▁a ▁trib ut ary ▁of ▁the ▁