 He was also the representative of the title of Viscount of Santa Mónica, in Portugal, after the death of his younger brother Henrique O'Neill, 1st Viscount of Santa Mónica unmarried and without issue.He was the Main Manager of the "Casa Comercial Torlades", Consul-General of Denmark, Belgium and Greece in Lisbon, Knight and Commander of the Order of Christ, and Knight and Commander of the Order of Our Lady of the Concepcion of Vila Viçosa, Commander of the Order of the Dannebrog of Denmark, Officer of the Order of Leopold of Belgium and of the Order of the Redeemer of Greece, Knight of the Order of the Rose of Brazil, etc., and a personal friend of King Ferdinand II of Portugal.He met Hans Christian Andersen during his visit to Portugal.