and Lithuanians erected new bishoprics in Esthonia (Dorpat), Oesel, and Semgallen, and effected the Christianization of nearly all these lands. He died in A.D. 1229. After A.D. 1219 the Danes, whom Albert had called in to his aid, vied with him in the conquest and conversion of the Esthonians. Waldemar II. founded Revel in A.D. 1219, made it an episcopal see, and did all in his power to restrict the advances of the Germans. In this he did not succeed. The Danes, indeed, were obliged to quit Esthonia in A.D. 1257. After Albert’s death, however, the difficulties of the situation became so great that Volquin, the Master of the Order of the Sword, could see no hope of success save in the union of his order with that of the Teutonic Knights, shortly before established in Prussia. The union, retarded by Danish intrigues, was not effected until A.D. 1237, when a fearful slaughter of Germans by the Lithuanians had endangered not only the existence of the Order of the Sword but even the church of Livonia. Then, too, for the first time was Courland finally subdued and converted. It had, indeed, nominally adopted Christianity in A.D. 1230, but had soon after relapsed into paganism. Finally in A.D. 1255 Riga was raised to the rank of a metropolitanate, and Suerbeer, formerly archbishop of Armagh in Ireland, was appointed by Innocent IV. archbishop of Prussia, Livonia, and Esthonia, with his residence at Riga. § 93.13. The Old Prussians and Lithuanians also belonged to the Lettish stem. Adalbert, bishop of Prague, first brought the message of salvation to the =Prussians= between the Vistula and Memel, but on the very first entrance into Sameland [Samland] in A.D. 997 he won the martyr’s crown. This, too, was the fate twelve years later of the zealous Saxon monk Bruno and eighteen companions on the Lithuanian coast. Two hundred years passed before another missionary was seen in Prussia. The first was the Abbot Gothfried from the Polish monastery of Lukina; but in his case also an end was soon put to his hopefully begun work, as well as to that of his companion Philip, both suffering martyrdom in A.D. 1207. More successful and enduring was the mission work three years later of the Cistercian monk Christian from the Pomeranian monastery of Oliva, in A.D. 1209, the real apostle of the Prussians. He was raised to the rank of bishop in A.D. 1215, and died in A.D. 1245. On the model of the Livonian Order of the Brethren of the Sword he founded in A.D. 1225 the Order of the Knights of Dobrin (_Milites Christi_). In the very first year of their existence, however, they were reduced to the number of five men. In union with Conrad, Duke of Moravia, whose land had suffered fearfully from the inroads of the pagan Prussians, Christian then called in the aid of the Teutonic Knights, whose order had won great renown in Germany. A branch of this order had settled in A.D.