At the extremity of the land-wall of Constantinople, where it meets the sea of Marmora, rises an enclosure flanked by battlemented towers. It is the first object seen by Frank ships, and thus the stranger is presented with a prospect that reminds him of the most striking and singular usage of Turkish despotism. This enclosure, and the towers, existed under the Greek empire, and were called “Heptapurgon,” from the number of the castles included. They were first erected by Zeno, and enclosed by the Comneni, and were employed as a prison for state offenders. When the Turks took possession of the city, the Sultan appropriated them as a secure place to deposit his plunder. They afterwards reconverted them to their original purpose of a state prison, and added a feature peculiarly their own. The character of an ambassador, held sacred by all other nations, was here violated. The first symptoms of a rupture between the Turks and a foreign state, was, to seize the resident minister, and incarcerate him in this prison; and the European states, instead of revolting against this barbarous outrage on the laws of nations, quietly submitted to it, as they did to the oppression of the Barbary pirates, because each rejoiced, and felt itself elated, at the degradation of the other. Mr. Beaufeu, a French minister, confined there, made his escape; and the Sultan was so enraged, that he immediately caused the governor to be strangled in his own prison. Since then, the Turks are not disposed to admit strangers, lest they might discover the secrets of their prison-house. This barbarous custom continued so late as the year 1784, when the Russian envoy was sent there, as the first act of hostility. The lights and usages of civilized Europe began immediately after to dawn on the East. The just and amiable Selim discontinued the practice, and the present Sultan has abolished it altogether. It was generally supposed the custom would be renewed, and the Sultan would think himself justified in imprisoning the ambassadors of all the powers leagued against him at Navarino, in retaliation for that wanton and unprovoked attack; but he suffered them quietly to depart, and set an example of moderation, and scrupulous regard to the law of nations, which European states might do well to imitate.