(Alexandros Ypsilantis was in prison in Austria at that time).
Modern History Sourcebook: The Treaty of London between Great Britain, France, and Russia for the Pacification of Greece, July 6, 1827, excerpts
In the Name of the Most Holy and Undivided Trinity. His Majesty the King of the United Kingdom of Great Britain and Ireland, His Majesty the King of France and Navarre, and His Majesty the Emperor of All the Russias, penetrated with the necessity of putting an end to the sanguinary struggle which, while it abandons the Greek Provinces and the Islands of the Archipelago to all the disorders of anarchy, daily causes fresh impediments to the commerce of the States of Europe, and gives opportunity for acts of Piracy which not only expose the subjects of the High Contracting Parties to grievous losses, but also render necessary measures which are burthensome for their observation and suppression;
His Majesty the King of the United Kingdom of Great Britain and Ireland, and His Majesty the King of France and Navarre, having moreover received from the Greeks an earnest invitation to interpose their Mediation with the Ottoman Porte; and, together with His Majesty the Emperor of All the Russians, being animated with the desire of putting a stop to the effusion of blood, and of preventing the evils of every kind which the continuance of such a state of affairs may produce;
They have resolved to combine their efforts, and to regulate the operation thereof, by a formal Treaty, for the object of re-establishing peace between the contending parties, by means of an arrangement called for, no less by sentiments of humanity, than by interests for the tranquillity of Europe.
For these purposes, they have named their Plenipotentiaries to discuss, conclude, and sign the said Treaty, that is to say; His Majesty the King of the United Kingdom of Great Britain and Ireland, the Right Honourable John William Viscount Dudley, a Peer of the United Kingdom of Great Britain and Ireland, a Member of His said Majesty’s Most Honourable Privy Council, and his Principal Secretary of State for Foreign Affairs; His Majesty the King of France and Navarre, the Prince Jules, Count de Polignac, a Peer of France, Knight of the Orders of His Most Christian Majesty, Marechal-de-Camp of his Forces, Grand Cross of the Order of St. Maurice of Sardinia, &c., &c., and his Ambassador at London; And His Majesty the Emperor of All the Russias, the Sieur Christopher Prince de Lieven, General of Infantry of His Imperial Majesty’s Forces, his Aide-de-Camp General, his Ambassador Extraordinary and Plenipotentiary to His Britannic Majesty, &c.; Who, after having communicated to each other their Full Powers, found to be in due and proper form, have agreed upon the following Articles…”