The Liber feudorum maior (or LFM, medieval Latin for "great book of fiefs"), originally called the Liber domini regis ("book of the lord king"), is a late twelfth-century illuminated cartulary of the Crown of Aragon. It was compiled by the royal archivist Ramon de Caldes with the help of Guillem de Bassa for Alfonso II, beginning in 1192. It contained 902 documents dating as far back as the tenth century. It is profusely illustrated in a Romanesque style, a rarity for utilitarian documents. The LFM is an indispensable source for the institutional history of the emerging Principality of Catalonia. It is preserved as a file in the Arxiu de la Corona d'Aragó (ACA), Cancelleria reial, Registres no. 1, in Barcelona.