de La Valette, a zealous leading member of the Catholic clericalists, as his ambassador to the Sublime Porte of the Ottoman Empire. Russia disputed that attempted change in authority. Referring to two previous treaties (one from 1757 and the Treaty of Küçük Kaynarca from 1774), the Ottomans reversed their earlier decision, renounced the French treaty and declared that Russia was the protector of the Orthodox Christians in the Ottoman Empire. Napoleon III responded with a show of force by sending the ship of the line Charlemagne to the Black Sea and thereby violated the London Straits Convention. The gunboat diplomacy show of force, together with money, induced Ottoman Sultan Abdülmecid I to accept a new treaty confirming France and the Catholic Church's supreme authority over Catholic holy places, including the Church of the Nativity, which had been held by the Greek Orthodox Church. Tsar Nicholas I then deployed his 4th and 5th Army Corps along the River Danube in Wallachia, as a direct threat to the Ottoman lands south of the river. He had Foreign Minister Count Karl Nesselrode undertake talks with the Ottomans. Nesselrode confided to Sir George Hamilton Seymour, the British ambassador in Saint Petersburg: The agreement referred to by the French was in 1740. At present most historians (except for the new Russian Orthodox nationalists) accept that the question of the holy places was no more than a pretext for the Crimean War. As conflict emerged over the issue of the holy places, Nicholas I and Nesselrode began a diplomatic offensive, which they hoped would prevent either British or French interference in any conflict between Russia and the Ottomans and prevent both from forming an anti-Russian alliance. Nicholas began courting Britain by means of conversations with Seymour in January and February 1853. Nicholas insisted that he no longer wished to expand the Russia Empire but that he had an obligation to the Christian communities in the Ottoman Empire. He next dispatched a highly-abrasive diplomat, Prince Menshikov, on a special mission to the Ottoman Sublime Porte in February 1853. By previous treaties, the sultan had committed "to protect the (Eastern Orthodox) Christian religion and its churches". Menshikov demanded a Russian protectorate over all 12 million Orthodox Christians in the Ottoman Empire with control of the Orthodox Church's hierarchy. A compromise was reached regarding Orthodox access to the Holy Land, but the Sultan, strongly supported by the British ambassador,