T. F. Tout, The Empire and the Papacy, 918-1273
“ Bernard, the Third Crusade was due to the prompt action of the great kings of Europe, and above all 297to Frederick Barbarossa. In the First Crusade the leadership of the Christian host fell to the lesser feudal princes, like the Count of Toulouse or the Count of Flanders. In the Second Crusade the Emperor and the King of France took the lead, but they went with insufficient resources, and left their dominions in disorder and anarchy. In the Third Crusade the three chief monarchs of Europe appeared at the head of well-equipped and fairly disciplined armies. ”
