1. ^1157 is the implication of Hugo Falcandus, while Evelyn Jamison (1913), "The Norman Administration of Apulia and Capua, more especially under Roger II and William I, 1127–66", Papers of the British School at Rome 6: 281, derives a date of 1158, from two charters of dated to Indiction VII, March and July 1159, in of the eighth year of William's reign, which is also described as "the second year of the princeship of our lord Robert, by the grace of God the most glorious prince of the Capuans, and himself our lord king's son" (secundo anno principatus domini nostri Robberti dei gratia capuanorum Gloriosissimi principis, et ejusdem domini nostri Regis filii)..
2. ^¹ Hiroshi Takayama, The Administration of the Norman Kingdom of Sicily (E. J. Brill, 1993), p. 104.
3. ^¹ Donald Matthew, The Norman Kingdom of Sicily (Cambridge University Press, 1992), p. 166.
4. ^G. A. Loud and Thomas E. J. Wiedemann, edd., The History of the Tyrants of Sicily by ‘Hugo Falcandus’, 1154–69 (Manchester University Press, 1998), p. 226.