Canonization is the declaration of a deceased person as an officially recognized saint, specifically, the official act of a Christian communion declaring a person worthy of public veneration and entering their name in the canon catalogue of saints, or authorized list of that communion's recognized saints.
Canonization of Elizabeth of Hungary in 1235. Sándor Liezen-Mayer (1863).
Pope Pius II canonizes Catherine of Siena.
The Turkish atrocities in Bulgaria (1876). On 3 April 2011, Batak massacre victims were canonized as saints.
On 4 November 1992, the Holy Synod of the Church of Greece unanimously declared saints those Christians who had been tortured and massacred by the Turks in the Great fire of Smyrna in 1922.
Hilarion the Great (291–371) was an anchorite who spent most of his life in the desert according to the example of Anthony the Great (c. 251–356). While Anthony is considered to have established Christian monasticism in the Egyptian Desert, Hilarion is considered by some to be the founder of Palestinian monasticism and venerated as a saint by the Orthodox and the Roman Catholic Church.
Hilarion the Great, by Basil II, c.1000 (Vatican Library)
"The Temptation of Saint Hilarion", by Octave Tassaert, c.1857 (Montreal Museum of Fine Arts)