Vatican
Pius X (1903–1914)
Obverse: St. Constantine, St. Helena, with Pope Pius X above them; at the bottom, a view of St. Peter’s Square; Reverse: A scene depicting Constantine presenting the edict to the pope; XVI + PLENO + SÆCULO + AB + EDICTO + PACIS + CONSTANTINIANÆ + PRO + ECCLEISA
silver-plated metal, 31.8 mm, 12.75 g, medal with a loop
