The famous Franciscan theologian, Bl. John Duns Scotus, even before his untimely death in 1308, was renowned for his defense of the Immaculate Conception and known as Marian Doctor par excellence. This book aims at acquainting the general public with the admirable figure of this Scottish-born friar. It does so, above all, to promote the knowledge and love of Christ Jesus and His Mother, the Virgin Mary, in the teaching and life of this holy theologian. Scotus, as a son of St. Francis of Assisi, stresses the primacy of love in theology. All else is ordered to love, and in love everything is perfected. For God is love and who abides in love abides in God and God in him (I Jn 4: 16). As taught by Scotus, the absolute primacy of Jesus and Mary — root and synthesis of all creation, heavenly as well as earthly — is the most perfect revelation of this divine love.