abstract:Tsargrad (Old Church Slavonic: Цѣсарьградъ; Church Slavonic; Царьгра̀дъ, ; Bosnian, Bulgarian, Croatian, Macedonian, Montenegrin, Serbian and Slovene: Carigrad or Цариград, depending on their alphabets (or Tsarigrad as an alternative Latin transliteration of Cyrillic); ; ; ; also rendered as Czargrad and Tzargrad; see Tsar) is a Slavic name for the city of Constantinople, the capital of the Eastern Roman Empire, commonly known as the "Byzantine Empire". Today the city is known as Istanbul, and is the largest city in Turkey.