No empire was created specifically in order to conquer Constantinople.
From 656-661 C.E. there was the Fitna al-Kubra or the First Islamic Civil War where the the Rightly-Guided Caliphate, the Khawarijites, and the Umayyad Caliphate all fought each other for dominance in Egypt, Levant, and Mesopotamia. The Umayyad Caliphate came out of that war as the single Islamic Empire and single Arab State. The Umayyads focused their attention northward and besieged Constantinople from 674-678 C.E.
Constantinople was not taken by the Arabs. It was taken by the Ottoman Turks who established the Ottoman Empire
Emperor Constantine the Great moved the capital of the Byzantine/Roman Empire from Rome to Constantinople around 330 AD.
Creating a new capital, Constantinople, which effectively saved the Roman Empire. Or at least created the Eastern Roman Empire. It was also a great trade center.
Constantinople
Constantinople
In 1453, Constantinople, the then capital of the Byzantine Empire, was captured by the Ottoman Empire.
Constantinople was taken over by the Turks of the Ottoman Empire in 1453.
Constantinople was in East Roman territory and was known as the city of Byzantium, and but was reinvigorated and reestablished by the Roman emperor Constantine, as his namesake in 306CE. The seat of Roman government was moved there briefly, and it soon became the head of the Eastern empire. After the collapse of the empire in c.476CE, and the following split, the eastern empire (now known as the Byzantine empire) was established, with its head at Constantinople. The city would remain a bastion of classical culture until her defeat at by the Ottoman Empire in 1453. The city's name was changed in 1930 to Istanbul.
The Capital of the Byzantine Empire was originally called Byzantium before being renamed as Constantinople (which was its name during its control by the Byzantine Empire) and renamed by Ottomans as Istanbul afterwards. Constantinople was the capital of the Byzantine empire
The Seljuk Turks did not directly defeat Constantinople; rather, they played a significant role in weakening the Byzantine Empire, which ultimately made the city more vulnerable to later conquests. The Seljuks won decisive battles against the Byzantines, such as the Battle of Manzikert in 1071, which resulted in significant territorial losses for the empire and encouraged further Turkish migration into Anatolia. This weakening of Byzantine power and territorial integrity set the stage for the later siege and fall of Constantinople by the Ottoman Turks in 1453.
For how many years constantinople the capital of a united roman empire ?
Yes they did. They managed to conquer Constantinople in 1204 and formed The Latin Empire of Constantinople until 1261 when The Emperor of Nicea reconquered the City for The Byzantine Empire.