 Through the mediation of Pope Calistus II and in return for aid against a rebellion led by Jordan of Ariano in 1121, the childless William ceded all his Sicilian territories to Roger and named him his heir.When William died in 1127, Roger inherited the mainland duchy; three years later, in 1130 in Palermo, he merged his holdings to form the Kingdom of Sicily with the approval of Pope Anacletus II.Sicily was granted, pending its Christian reconquest, to Robert Guiscard as "duke" in 1059 by Pope Nicholas II.