and to the prejudice of all Christendom. He exhorts them to maintain unity and peace with one another, and appoints certain arbitrators to decide the differences between them. The quarrel was of no great importance, nor of any long duration, for the same year pope Innocent wrote to both orders, praising them for their exertions in the cause of the cross, and exhorting them strenuously and faithfully to support with all their might the new king of Jerusalem.[100] In the year 1201 the Grand Master of the Temple, Gilbert Horal, was succeeded by brother Philip Duplessies, or De Plesseis,[101] who found himself, shortly after his accession to power, engaged in active hostilities with Leon I., king of Armenia, who had taken possession of the castle of Gaston, which belonged to the Knights Templars. The Templars drove King Leon out of Antioch, compelled him to give up the castle of Gaston and sue for peace. A suspension of arms was agreed upon; the matters in dispute between them were referred to the pope, and were eventually decided in favour of the Templars. The Templars appear at this period to have recovered possession of most of their castles and strongholds in the principalities of Tripoli and Antioch. Taking advantage of the dissensions between the neighbouring Moslem chieftains, they gradually drove the infidels across the Orontes, and restored the strong mountain districts to the christian arms. Some European vessels having been plundered by Egyptian pirates, the Templars unfolded their war-banner, and at midnight they marched out of Acre, with the king of Jerusalem, to make reprisals on the Moslems; they extended their ravages to the banks of the Jordan, and collected together a vast booty, informing their brethren in Acre of their movements by letters tied to the necks of pigeons. Coradin, sultan of Damascus, assembled a large body of forces at Sepphoris, and then marched against the hill fort Doc, which belonged to the Templars. The place was only three miles distant from Acre, and the population of the town was thrown into the utmost consternation. But the military friars, assembling their forces from all quarters, soon repulsed the invaders, and restored tranquillity to the Latin kingdom.