The “Letter of Love and Concord” is a unique source, which allows us a glimpse into the political and religious aspirations of the Armenian Cilician elite at the end of the twelfth century, alluding to its hopes and expectations from the Crusades and the Church of Rome, as well as its uneasy relationship with the Byzantine Empire. The “Letter” is especially valuable for the wealth of information it contains on the royal ideology nurtured within the highest circles of the ruling Rubenid dynasty. The study provides an analysis of the sources used by its anonymous author, placing them within a historical context. Moreover, this marks the first time that a text based on the study of surviving sixty nine manuscripts along with its English translation has been made available for scholars.