The Keçiören Bağlumspor is a team that is from the second largest city, behind what former imperial capital?
Keçiören Bağlumspor (women's hockey): The Keçiören Bağlumspor is a Turkish women's field hockey side of Keçiören Bağlum SK based in Bağlum neighborhood of Keçiören district in Ankara, Turkey. Ankara:  With a population of 4,587,558 in the urban center and 5,150,072 in its province , it is Turkey's second largest city after former imperial capital Istanbul, having overtaken İzmir.
Istanbul