Fürstentum Tarent
The Fourth Crusade was launched by Walter's immediate suzerain, Count Theobald III of Champagne, in November 1199. Walter promptly took the cross and started persuading prospective crusaders, such as his cousin Walter of Montbéliard, to assist him in his upcoming campaign in southern Italy on their way to the Holy Land. Besides recruiting men, Walter energetically collected money and supplies from 1200, selling or mortgaging all of his land by April 1201. He also secured the blessing and significant aid from Pope Innocent III. Innocent was the guardian of King Frederick but determinedly opposed to his regents. He refused Walter's petition to recognize Elvira's claim to Frederick's throne; instead, he recognized the couple's right to the Principality of Taranto and the County of Lecce. In return, Tancred's family was compelled to recognize Frederick as their king. Walter knew that securing possession of Taranto and Lecce would give him a sufficient power base and agreed.