With the arrival of the Knights, the Grand Master took full control, acting like a prince, while the Mdina nobles lost their power. In 1560, a Maltese named Mattew Callus sent a petition to the King of Spain against the autocratic rule of Grand Master de Valette but was arrested and hanged for treason. Despite this, life for common Maltese continued unchanged, facing raids by Berber corsairs. In 1551, Corsair Dragut attempted to attack Mdina but attacked Gozo Castle instead.