The Morea was now partitioned between Constantine, who took possession of the eastern portion, embracing Lakonia, Argolis, Corinth, and the southern shore of the Corinthian Gulf as far as Patras, and Thomas, who governed the western part. With all his faults Constantine was a man of far greater energy and patriotism than the rest of his family, and he lost no time in developing a national policy. His first act was to restore the Hexamilion; his next, to attempt the recovery of the Athenian duchy from the Acciajuoli family for the Greek cause, which he personified. Nine years earlier, on the death of Duke Antonio, he had sent Phrantzes to negotiate for the cession of Athens and Thebes. Foiled on that occasion, he now invaded the duchy and forced the weak Duke Nerio II to do homage and pay tribute to him. The Albanians and Koutso-Wallachs of Thessaly rose in his favour; the Serbs promised to aid him in defending the Isthmus against the Turks; it seemed for the moment as if there were at last some hope of a Christian revival in the Near East. But the battle of Varna soon put an end to these dreams. Murad II, accompanied by the Duke of Athens, set out in 1446, at the head of a large army, for the Isthmus. The two Despots had assembled a considerable force behind the ramparts of the Hexamilion, which seemed so imposing to the Sultan that he remonstrated with his old military counsellor, Turakhan, for having advised him to attack such apparently impregnable lines so late in the season. But the veteran, who knew his Greeks and had taken the Hexamilion twenty-three years before, replied that its defenders would not long resist a determined attack. A Greek officer, who had been sent by Constantine to reconnoitre the Turkish position, came back so terrified at the strength of the enemy that he urged his master to retreat at once to the mountains of the Morea. The Despot ordered his arrest as a disciplinary measure, but he was so greatly struck by what he had heard that he sent the Athenian Chalkokondyles, father of the historian, to offer terms of peace to the Sultan. Murad scornfully rejected the proposals, arrested the envoy, and demanded, as the price of his friendship, the destruction of the Hexamilion and the payment of tribute. This was too much for the high-spirited Despot, and the conflict began.