The Greeks too profited by the enlightened policy of their sovereign. One Greek monk at this time made the road to the monastery of St John the Hunter on the slopes of Hymettos, to which the still standing column on the way to Marathon alludes; another built one of the two churches at the quaint little monastery of Our Lady of the Glen, not far from the fort of Phyle. For thirty years Athens enjoyed profound peace, till a fratricidal war between Guillaume de Villehardouin, the ambitious Prince of Achaia, and the great barons of Eubœa involved Guy in their quarrel. The prince summoned Guy, his vassal for Argos and Nauplia, to assist him against his foes; Guy, though bound not only by this feudal tie but by his marriage to one of William’s nieces, refused his aid, and did all he could to help the enemies of the prince. The latter replied by invading the dominions of his nephew. Forcing the Kakè Skála, that narrow and ill-famed road which leads along the rocky coast of the Saronic Gulf towards Megara, he met Guy’s army at the pass of Mount Karydi, “the walnut mountain,” on the way to Thebes. There Frankish Athens and Frankish Sparta first met face to face; the Sire of Athens was routed and fled to Thebes, where he obtained peace by a promise to appear before the High Court of Achaia and perform any penalty which it might inflict upon him for having borne arms against the Prince. The High Court met at Nikli near Tegea; and the Sire of Athens, escorted by all his chivalry, made a brave show before the assembled barons. They were so much impressed by the spectacle that they declared they could not judge so great a man, and referred the decision to St Louis of France, the natural protector of the French nobles of Greece. The chivalrous monarch propounded the question to the _parlement_ at Paris, which decided that Guy was technically guilty, but that the trouble and cost of his long journey to France was ample punishment for his offence. Louis IX, anxious to show him some mark of royal favour, conferred upon him, at his special request, the title of Duke of Athens, for which, he told the king, there was an ancient precedent. The ducal style borne by Guy and his successors has become famous in literature as well as in history. Dante, Boccaccio, Chaucer, and Shakespeare bestowed it upon Theseus, and the Catalan chronicler, Muntaner, upon Menelaos.