Constantinople(Name of present-day Istanbul from 330-1930 C.E.. Previously known as Byzantium) proper noun [UK: ˌkɑːn.stæn.təˈno.pəl] [US: ˌkɑːn.stæn.təˈno.pəl]
Costantinopoliproper noun {f}It took us six years to conquer Constantinople. = Ci sono voluti sei anni per conquistare Costantinopoli.