ALPHONSE I. count of Toulouse, son of Count Raymond IV. by his third wife, Elvira of Castile, was born in the castle of Mont-Pelerin, Tripoli. He was surnamed Jourdain on account of his having been baptized in the river Jordan. In his tenth year he succeeded to the countship of Toulouse and the marquisate of Provence, but Toulouse was taken from him by William IX., count of Poitiers, in 1114. He recovered a part in 1119, but continued to fight for his possessions until about 1123. He next f ought for the sovereignty of Provence against Raymond Berenger I., and by a peace reached in Sept. 1125 Jourdain became absolute master of the regions lying between the Pyrenees and the Alps, Auvergne and the sea.
His ascendancy was an unmixed good to the country, for during a period of 24 years art and industry flourished. Louis VII., f or some reason which has not appeared, besieged Toulouse in 1141, but without result. Jourdain was twice excommunicated, but in 1146 he took the cross at the meeting of Vezelay called by Louis VII., and in Aug. 1147 embarked for the East, reaching Acre in 1 148. He was poisoned at Caesarea, either the wife of Louis or the mother of the king of Jerusalem having suggested the draught.
See the documentary Histoire generale de Languedoc by De Vie and Vaissette, vol. iii. (Toulouse, 1872) .