In Istanbul, there are numbers of graves of sahaba (Holy Prophet’s companions). They came with the Muslim armies in the 7th and 8th centuries when the city was under siege by the Arabs. The First Siege of Constantinople (Istanbul) had lasted for four years between 674-678 during the reign of Muawiyah I. This siege came at the back of the Battle of the Masts which resulted in the Arab victory.
There was another siege of Constantinople by the Arabs which is known as The Second Arab Siege of Constantinople in 717–718 but it was during the first siege when many sahaba traveled to Constantinople. During the this period of four years (674-678) many sahaba took their last breath outside the city walls of Constantinople. For centuries their final resting places were forgotten or they were in a bad shape but when Ottoman entered in Constantinople in 1453. They took good care of these graves and the areas around them.