Built as Byzantium around 657 BC and then renamed Constantinople in the 4th century CE after Constantine the Great made the city his capital, the city of Istanbul officially received its present name on this day in 1930. Surprisingly, the capital of the Byzantine Empire was not renamed after the Ottomans captured it in 1453. Variations of “Constantinople” continued to be used by the Turkish-speaking conquerors long after they took control of the city. “It’s a fact that the Ottomans called Istanbul ‘Kostantiniyye,’ among other names, in thousands of their official documents,” said Christoph Herzog, chair of Turkish studies at...