Pope Innocent III urged Andrew to lead a crusade to the Holy Land, but Andrew hatched a new conspiracy against Emeric with the help of John, Abbot of Pannonhalma, Boleslaus, Bishop of Vác, and many other prelates and lords. The Pope threatened him with excommunication if he failed to fulfill his father's vow, but Andrew did not yield. The conspiracy was uncovered on 10 March 1199, when King Emeric seized letters written by Andrew's partisans to Bishop Boleslaus. That summer, royal troops routed Andrew's army near Lake Balaton, and Andrew fled to Austria. A papal legate mediated a reconciliation between Andrew and Emeric, who allowed Andrew to return to Croatia and Dalmatia in 1200. Andrew married Gertrude of Merania; her father, Berthold, Duke of Merania, owned extensive domains in the Holy Roman Empire along the borders of Andrew's duchy.