History of Istanbul in a few lines:

Origins and Foundation:

Founded by Greek colonists from Megara around 667 BC, the city was originally called Byzantium. Its strategic location between Europe and Asia, controlling the Bosphorus Strait, made it a vital trading hub from its beginnings.

Middle Ages:

Byzantine Constantinople: In 330 AD, the Roman Emperor Constantine the Great refounded it as Constantinople and made it the new capital of the Eastern Roman Empire (later known as the Byzantine Empire). For a thousand years, it was the richest and most powerful Christian capital in Europe, a beacon of culture and art, and the seat of the Eastern Orthodox Church, withstanding numerous sieges.

From the 15th to the early 20th centuries:

Ottoman Capital: On May 29, 1453, the Ottoman Sultan Mehmed II "the Conqueror" captured the city, bringing an end to the Byzantine Empire. Constantinople became the magnificent capital of the vast Ottoman Empire for nearly 500 years. The city transformed into a cosmopolitan Islamic center, with the construction of monumental imperial mosques such as the Blue Mosque and the conversion of Hagia Sophia into a mosque.

20th Century and Present Day:

Following the fall of the Ottoman Empire after World War I and the establishment of the Republic of Turkey by Mustafa Kemal Atatürk in 1923, the capital was moved to Ankara. The city was officially renamed Istanbul in 1930. Today, it is Turkey's largest cultural, historical, and economic center, a vibrant metropolis that bridges continents and cultures, renowned for its UNESCO World Heritage sites, the Bosphorus, and its modern energy.