Following the Treaty of Vienna, The Order of Saint Joachim continued to be associated with the House of Sachsen-Coburg und Gotha. Ernest III, Duke of Saxe-Coburg-Saalfeld (2 January 1784 – 29 January 1844) continued to award the Order of Saint Joachim. A letter from 1821 exists from a Dr. Joseph Romain Louis de Kirckhoff (also de Kerckhov) thanking Ernst I, Herzog von Sachsen-Coburg und Gotha for awarding him the Order of Saint Joachim. His son, Ernest II, (21 June 1818 – 22 August 1893) is known to have included the Order's post-nominals "K.J." among his awards and honours. Bulgarian Tsar Ferdinand I of Bulgaria (26 February 1861 – 10 September 1948) a prince of the Koháry branch of the ducal family of Saxe-Coburg-Gotha, was popularly pictured with the insignia of The Order of St Joachim in 1888, although the connection between the two is unknown.