This volume offers the first comprehensive introduction in English to the study of the philosopher and theologian Raimundus Lullus (c. 1232-1316). From the 1270s onwards Lullus worked on his Art: a philosophico-theological system which takes the basic concepts of the three monotheistic religions of its time and discusses them by means of rational discourse in order to convince Muslims (and Jews) of the truth of the Christian articles of faith. Revising his Art and extending it across all fields of human knowledge, Lullus created a universal science that strongly influenced thinkers such as Nicholas of Cusa and Leibniz. He produced some 280 works in both Catalan and Latin, the Latin Opera currently being edited in the Corpus Christianorum, Continuatio Mediaevalis series. The present Introduction provides a key to Lullus? prolific philosophical and theological output. It is divided into three sections: Lullus' life, his works and his thought, i.e. the Ars. The first section offers a survey of Lullus' eventful life (his conversion, illumination, travels, etc.) and presents the historical context for his intellectual projects. The second section offers a full catalogue of all his works, together with a short summary of each of them, an appreciation of their importance and basic bibliographical information concerning editions and further literature. The third section gives an explanation of Lullus' Art, its mechanisms and its philosophical implications; it also shows how his thought manifested itself in the different realms of knowledge: natural, human and divine. The book is the result of a joint effort by international scholars specialising in Lullus, who have been working on this Introduction since 2003, namely, Oscar de la Cruz, Fernando Dominguez, Jordi Gaya, Robert D. Hughes, Marta M. Romano and the editors. Languages: English.