Hannah-Lena Hagemann is the Principal Investigator of the Emmy Noether research group “Social Contexts of Rebellion in the Early Islamic Period” (SCORE) at the University of Hamburg. She is author of The Khārijites in Early Islamic Historical Tradition (Edinburgh University Press, 2021) and co-editor (with Stefan Heidemann) of Transregional and Regional Elites: Connecting the Early Islamic Empire (De Gruyter, 2020). Alasdair C. Grant is Research Associate in the Emmy Noether project “Social Contexts of Rebellion in the Early Islamic Period” (SCORE) at the University of Hamburg. He is author of Greek Captives and Mediterranean Slavery, 1260–1460 (Edinburgh University Press, 2024).