On 15 December 1167, when Stephen had the court moved temporarily to Messina, Henry remained at Palermo to lead the conspirators, whose ranks included Matthew of Ajello, the "gaito" or judge Richard and Bishop Gentile of Agrigento. When the court returned to Palermo shortly after 12 March 1168, its last session in Messina, Henry demanded, in council, the Principality of Taranto, which had been confiscated from Simon, an illegitimate son of Roger II, and all of Simon's other lands. Then, Gilbert, Count of Gravina, another cousin of Henry and Margaret, rose in council, denounced the count and accused him of treason. The charge was easily established, as Henry had admitted the conspiracy to a judge of Messina a short time before. He was promptly arrested and interned in Reggio di Calabria, while the "Spanish knights" who had accompanied him were given a day to leave Sicily, which they did.