It is remarkable how large a space the abolition of the slave trade occupied in the foreign policy of Great Britain, when the liberties of Europe were at stake. During the months preceding the meeting of the congress of Vienna, which had been postponed till September by the tsar, British diplomacy had been engaged in a strenuous effort to obtain the co-operation of such European powers as possessed American colonies in securing this philanthropic object. Sweden had already consented to it, and now Holland also gave her consent. Portugal agreed to relinquish the trade north of the equator, on condition that the other powers consented to impose a similar restriction on themselves. Strong pressure was brought to bear upon France to consent to the immediate abolition of the trade, and Wellington, who had been created a duke in May and who arrived at Paris in August in the capacity of British ambassador, was authorised by Liverpool to offer the cession of Trinidad or the payment of two or three million pounds to obtain this end. By the treaty of Paris only French subjects were allowed to trade in slaves with the French colonies, and French subjects were excluded from trading elsewhere; and the whole trade was to cease within French dominions after five years. Talleyrand, negotiating with Wellington, refused to consent to a general abolition, but, on being pressed to surrender the slave trade north of the equator, consented to abandon it to the north of Cape Formoso. In the following year Napoleon on his return from Elba ordered its immediate suppression, and this was not the least significant act of the Hundred Days. With Spain our diplomatists were less successful. The British government refused to renew its subsidy to Spain for the last half of 1814 except on condition that Spain relinquished the slave trade north of the equator at once, and consented to relinquish that south of the equator in five years' time; while it would not issue a loan except on condition that Spain abolished the whole trade immediately. Even these terms did not prevail with Spain, and the most that she would grant at the congress was to relinquish the trade at the conclusion of eight years.