“…Stable isotope ratio analysis of archaeological human and faunal remains has been a major technique for palaeodietary studies for over the last 40 years (DeNiro & Epstein, 1981; Schoeninger & DeNiro, 1984; van der Merwe & Vogel, 1978). It has provided invaluable data with which to better understand the dietary patterns among ancient populations worldwide (e.g., Richards, Fuller, & Molleson, 2006; Fuller et al, 2012; Mannino et al, 2015; Guiry et al, 2016; Ma et al, 2016a; 2016b; Phaff, Burley, & Richards, 2016; Commendador, Finney, Fuller, Tromp, & Dudgeon, 2019). It has been used to determine the diet of a variety of historic civilizations around the Mediterranean, such as the ancient Greeks, the Romans, the Byzantines, and Medieval populations (e.g., Bourbou, Fuller, Garvie‐Lok, & Richards, 2011; Craig et al, 2009; Fuller, Marquez‐Grant, & Richards, 2010; Keenleyside, Schwarcz, Stirling, & Lazreg, 2009; Killgrove & Tykot, 2013; Prowse, Schwarcz, Saunders, Macchiarelli, & Bondioli, 2004, 2005; Rissech et al, 2016; Rutgers, van Strydonck, Boudin, & Van der Linde, 2009).…”