From the year 1815 until 1823 the Duke of Wellington’s name rarely appears in connexion with any public transactions, with the exception that in December, 1818, he was appointed Master-General of the Ordnance, an office which he continued to fill for some years.

In 1819 he made one speech in parliament in which his declared his belief that Roman Catholic Emancipation was impossible, unless there could be a proper security for the Protestant religion, which he doubted.

In the year 1823, on the appointment of Mr. Canning to be Secretary for Foreign Affairs, Duke of Wellington was named as the Plenipotentiary of the King of Great Britain at the Congress of Verona.  It was supposed that the subject matter of the discussions of the sovereigns at that congress would be the relations of Russia and Turkey.  On the Duke’s arrival at Paris, however, he found that Spain would form the main subject.  He wrote back for fresh instructions, and Mr. Canning’s answer distinctly stated that should France attempt to interfere in Spain either by force or by menace, he was to instruct the Duke “frankly and peremptorily to declare, that to any such interference, come what may, his majesty will not be a party.”

The words “frankly and peremptorily” could not have been better chosen, or more agreeable to the character of the Duke.  He stuck simply and stedfastly to his text throughout the negotiations, and when at last, in consequence of the state of affairs in Spain, the three great powers agreed to withdraw their ministers from Madrid, the Duke told them he should not withdraw ours but leave him there in the hope of allaying the irritation which the measures of the others were calculated to produce.

The Duke returned to Parts in December, and found the French not indisposed to some arrangement.  When it subsequently became necessary to send a special communication to the Spanish government, a mark of respect was paid by Mr. Canning to the Duke of Wellington, more gratifying perhaps to him than his titles or honours.  The desire of the British Government was to attach a special character of friendliness to this communication, and for that purpose the Duke of Wellington was requested to make it.  This course was taken because it was believed that the private opinions of a man who had conferred such distinguished benefits on Spain, and who had been on terms of personal intercourse and friendship with many of the leading men, would be listened to with more deference than even an official communication.  It is unnecessary to pursue this subject farther, as the Duke of Wellington’s connexion with it ceased; except that he gave, in the House of Lords, on the 24th of April, a full explanation of his share in the proceedings.

In 1826, the Duke having been appointed ambassador to St. Petersburgh, on the anniversary of the entrance of the allied army into Paris under his command, the Emperor Nicholas addressed a letter to him, in which he told him that in order to testify to him his particular esteem for his great qualities and for the distinguished services he had rendered to the whole of Europe, he had given orders that the Smolensko regiment of infantry, formed by Peter the Great, and one of the most distinguished of his army, which was formerly under the Duke’s command in France, should thenceforward be called the Duke of Wellington’s regiment.