St John’s Co-Cathedral is a gem of Baroque art and architecture. Its rich history and artistic heritage is due to the fact that, for over 200 years, it was the conventual church of the Order of St John of Jerusalem. Over the years, the grand masters, dignitaries, and knights donated gifts of high artistic value and made enormous contributions to enrich it with the best works of art by the leading artists available to them. The book outlines the history of the church. It also describes the chapels, the art and the treasures found within. Moreover it is the first book to be published after the completion of the restoration project of the main nave.