His coup was backed by the vice chancellor Matthew d'Ajello and the official class, while the rival claims of his aunt Constance and her husband, Henry VI, King of the Romans, were supported by most of the nobles.
Kudetanya didukung oleh kanselir Matteo d'Aiello dan kelas resmi, sedangkan tuntutan saingan bibinya Costanza dan suaminya, Heinrich VI, Raja Romawi, didukung oleh hampir seluruh bangsawan.