Jab Roman Empire ke dui bhaag me baat dewa gais tab ii city East Roman Empire, jiske Byzantine Empire ke naam se bhi jaana jaawat rhaa, ke capital banaa. Iske kuch din talak Crusaders log occupy kar liin rahaa lekin ii bahut din talak Europe ke ek political, cultural, religious aur economical center rahaa jab talak ii 1453 me Ottoman Turks ke niche nai aais.