Istanbul became a major Muslim centre after 1453.

The evidence

1. The chain of transmitters — passage/muwatta-1-062

   1. person/malik-ibn-anas
   2. person/musa-ibn-uqba
   3. person/abd-al-rahman-ibn-zayd-al-ansari

   A Muwatta hadith with isnad.

2. chronicle — place/istanbul

   Istanbul — from Constantinople to the Ottoman capital.

3. object — object/sayf-awrangzib

   Aurangzeb's sword — a relic of the late Mughal-Ottoman age.