Book excerpt: At the intersection of Jewish studies and linguistic research, the essays assembled in this book approach the topic of the languages of Sephardic Jews from different perspectives, spanning chronologically from the Middle Ages to the present day. Drawing on diverse sources – from medical glossaries to inquisition archives, from rabbinic responsa to recordings of today's speakers – the scholars collaborating on this project have endeavoured to reconstruct fragments of a complex and elusive linguistic reality, which over the centuries has been shaped by the historical experience of its speakers. An innovative collection of rigorously conducted synchronic and diachronic studies that contributes to expanding our knowledge and opening new perspectives on crucial issues, such as the effects of contact on the linguistic structures, the possibility of a norm for polycentric languages, the relationship between the lexicon of a language and the vitality of its speech community.