He served as a Representative and Senator from the Las Villas Province and also as the Cuban Minister Plenipotentiary and Envoy Extraordinary to Panama, Peru, Netherlands, Belgium and Luxembourg.
Afterward he became head of the commission appointed to promote the commercial relations between the United States and Central/South American countries with the rank of Envoy Extraordinary and Minister Plenipotentiary.
He died at Collinton House, Midlothian, in April 1858, aged 81, and was succeeded in the barony by his son, Sir Ralph Abercromby, KCB, who was Secretary of Legation at Berlin and served as Envoy Extraordinary and Minister Plenipotentiary to Sardinia between 1840 and 1851 and to The Hague between 1851 and 1858.
He was also Envoy Extraordinary to the Barbary States from 1813 to 1814, to the Kingdom of Naples in 1814 and to Spain from 1822 to 1824 and served as Ambassador to Portugal between 1824 and 1828.
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The accomplished abbate was sent on this delicate mission in 1696, with the title of envoy extraordinary, and he fulfilled his difficult task so well that Pope Innocent XI, in recognition of certain privileges he had secured for the Hanoverian Catholics, consecrated him bishop of Spiga on the Sea of Marmora (modern day Biga in Turkey).
Appointed on 6 July 1867 to Italy as envoy extraordinary and minister plenipotentiary to Victor Emmanuel, he represented Great Britain in Italy during one of the most critical periods of Italian history ; he saw the entry of the Italian troops into Rome and the beginning of a new era of national life.
After the Russo-Turkish War of 1878 he went to Plovdiv (modern Bulgaria) as Austro-Hungarian envoy extraordinary on the International Eastern Rumelian Commission.
His commissions included final negotiations which resulted in the acquisition of the Panama Canal Zone, service as special ambassador to France to receive the body of John Paul Jones and Special Envoy Extraordinary to Japan, arranging the visit of the U.S. fleet to that country in 1908.
Upon James II's accession to the British throne, Ignatius White of Albeville became a royal advisor and in 1687 went to The Hague as envoy extraordinary.
Manicasothy served as Ceylon's Commissioner in Singapore and Malaya (1950–1957), Minister Plenipotentiary and Envoy Extraordinary to Indonesia (1954–1957) during which time he was involved in organising the Asian-African Conference, better known as the Bandung Conference, in 1955 and Honorary Consul-General in Bangkok (1958–61).
Simon de la Loubère, who was a French envoy extraordinary to the king of Ayutthaya, wrote in his book about Talat Khwan (Talacoan) as a principal place of the Chaophraya river side.
In 1853, he was named envoy extraordinary to the king of Denmark, and he acted as her majesty's representative at the conference of Copenhagen in November 1855 for the definite arrangement of the Sound dues question.
Robert Wolseley (died 1697), Envoy-Extraordinary to the Governor General of the Spanish Netherlands, died unmarried