Alex Metcalfe is Senior Lecturer in History at Lancaster University. He has published a number of works exploring the political, religious, social, and linguistic history of the medieval Mediterranean, including I Musulmani dell’Italia medievale (Palermo, 2019).Hervin Fernández-Aceves is a Postdoctoral Research Associate at Lancaster University. He has published works investigating aristocratic power, prosopography, digital humanities, and the socio-political history of the medieval Mediterranean, including his monograph County and Nobility in Norman Italy (London, 2020).Marco Muresu is a Postdoctoral Research Associate at Lancaster University. In addition to numerous articles on the archaeology of Sardinia, he has published an award-winning monograph on its Byzantine coinage and metal artefacts, La moneta “indicatore” dell'assetto insediativo della Sardegna bizantina (secoli VI-XI) (Perugia, 2018).