The Grand Masters of the Knights Templar during the later 12th and the 13th century used a double-sided seal which showed a representation of The Dome of the Rock (or a circular dome of the Church of the Holy Sepulchre) on one side, and the Order's symbol of two knights on one horse on the other side. This design is first attested as in use by Bertrand de Blanquefort, the order's sixth Grand Master, in 1158, forty years after its foundation, and it remained in use until the dissolution of the order in 1312. There was also a smaller, single-sided seal, which showed the Dome of the Rock (or the Holy Sepulchre), only. Different seals were used by provincial masters of the order. According to a papal bull issued by Innocent IV in 1251, it was customary for successive provincial masters to use the same seal. The master of Provence continued to use an Agnus Dei seal, while the seal of the Aragonese master William of Cardona and his successors depicted a knight on horseback, carrying a lance and shield, on which was a cross bearing the legend: S. MINISTRI TEMPLI 1 ARAGON 7 CATALON ("Seal of the minister of the Temple in Aragon and Catalonia"). Templars Seal Themes Dome of the Rock and Al Aqsa Mosque The reverse of Bertrand de Blancafort's seal, Master of the Temple 1168 in Staatsarchiv Amberg The reverse of Grand Master William of Chartres seal from 1214 also depicts the Dome of the Rock. Agnus Dei In heraldry, a Lamb of God (or paschal lamb, or agnus Dei) is a lamb passant proper, with a halo or charged with a cross gules, and the dexter forelimb reflexed over a cross staff from which a pennon of St. George (Argent a cross gules) is flotant. The seals of the Masters of the Temple in England: of Aimery de St Maur, 1200, Robert of Sandford, 1241, Richard of Hastings, 1160–85, and William de la More, 1304, showed the agnus Dei. SIGILLVM TEMPLI The obverse of a seal used by William de la More, master, 1304, resembles the above text . The reverse, a small oval counter-seal, with beaded borders, shows on the right a couped bust of a bearded man wearing a cap. and have the legend:— TESTIS SUM AGNI ("I am a witness to the Lamb") William de la More, styled frater Willelmus de la