 They defeated the ex-Emperor in July 476, and blocked him on a hill called "Constantinople" by local populations.While Illus and Trocundus besieged Zeno, Basiliscus was losing the support of the aristocracy and the Church in the capital because of his religious position; he also lost Illus and Trocundus' support, as he allowed the population of the capital to massacre all Isaurian who had not left the city with Zeno.Illus and Trocundus were secretly instigated by the Senate of Constantinople to betray Basiliscus.