 An agreement was reached with the Byzantine envoy, John Kamateros, but it required Godfrey of Würzburg, Frederick of Swabia and Leopold of Austria to swear oaths for the crusaders' good behaviour.Bishop Hermann of Münster, Count Rupert III of Nassau, the future Henry III of Dietz and the imperial chamberlain Markward von Neuenburg with a large entourage were sent ahead to make preparations in Byzantium.At the Strasbourg assembly in December 1187, Bishop Godfrey of Würzburg urged Frederick to sail his army to the Holy Land rather than proceed overland.