In 479 Marcian tried to overthrow Zeno and claim the throne for himself. With the help of his brothers Procopius Anthemius and Romulus, he gathered in Constantinople troops composed of both citizens and foreigners in the house of a Caesarius, south of the Forum of Theodosius, and from there they marched at the same time on the imperial palace and on the house of Illus, who was a supporter of Zeno. The emperor almost fell into the hands of the rebels, who, during the day, overwhelmed the imperial troops, who were also attacked by citizens from the roofs of their houses. During the night, however, Illus moved an Isaurian unit, quartered in nearby Chalcedonia, into Constantinople and also corrupted Marcian's soldiers, who allowed Zeno to flee. The following morning, Marcian, understanding that his situation was desperate and that reinforcements from Theodoric Strabo would not arrive in time, took refuge in the church of the Holy Apostles, but was arrested with his brothers.