Meanwhile the Grand Vizier Khalil was dismissed from office by the Sultan for the incapacity which he had shown in the campaign and in the battle of Belgrade. After a time he was succeeded by Damad Ibrahim, a son-in-law and lifelong favourite of the Sultan, who held the post for twelve years, till the deposition of Achmet in 1730. He proved himself in every way worthy of his high office. There was a desire in many quarters to embark on another campaign for the recovery of Hungary. But in the winter of 1717-18 the British Ambassador again proposed mediation, on behalf of England and Holland, on the principle of _Uti possidetis_. This was accepted by both Austria and the Porte. The Emperor was willing to content himself with what he had already achieved, the more so as there was danger of war in other directions. There was more difficulty on the part of the Ottomans. But the Sultan and the Grand Vizier ultimately gave their decision in favour of peace. The precedent of the Congress of Carlowitz was closely followed. A congress was held at Passarowitch, a small town in Serbia. England and Holland again acted as mediators. After long discussion, agreement was arrived at, and was embodied in a treaty known as that of Passarowitch, on July 21, 1718. By its terms the whole of what remained of Hungary to the Ottoman Empire after the treaty of Carlowitz, a large part of Wallachia, bounded by the River Aluta, and the greater part of Serbia, and a portion of Bosnia bounded by the Rivers Morava, Drina, and Unna, together with the fortresses of Belgrade and Semendria, were ceded to the Emperor. The Republic of Venice, on whose behalf Austria had embarked on the war, fared badly by the treaty. It had to give up to Ottoman rule the whole of the Morea which had been reconquered by Damad, but received some concessions in Dalmatia. It was, however, arranged by the Congress that the Porte should have an access to the Adriatic, so as to protect the Republic of Ragusa from Venice. There remained to Venice of its possessions in this quarter only the island of Corfu, the other Ionian islands, and a few ports on the Albanian and Dalmatian coasts. The Porte engaged by the treaty to put a stop to the piracy of Algiers, Tunis, Tripoli, and Ragusa, and to prohibit the residence of the Hungarian rebels in the vicinity of the new Austrian frontier.