The medal was established by Leo XIII on July 17, 1888, to commemorate his golden sacerdotal jubilee and was originally bestowed on those men and women who had aided and promoted the jubilee, and by other means assisted in making the jubilee and the Vatican Exposition successful. In 1898, it became a permanent papal distinction. Pius X reduced the classes to a single one in 1908. Until 1993, it was the highest honour that could be obtained by women.
The cross was initially only cast in gold and silver. A bronze version was added later. On the medal is a cross made octangular by fleurs-de-lis fixed in the angles of the cross. The arms of the cross narrow towards the center, with slightly indented ends, approaching the form of the patonce cross. In the center of the cross is a small medal with the image of Leo XIII. The words "Leo XIII P. M. Anno X" circle the image. In the center of the reverse side are the papal emblems. The mottoPro Ecclesia et Pontifice is stamped in the circle surrounding the emblems. On the obverse side of the medal, the branches of the cross are comets, which, with the fleurs-de-lis, form the coat of arms of the. Stamped on the reverse side are the words "Pridie", "Kal", and "Januar" and the year "1888". The medal's ribbon is red, with delicate lines of white and yellow on each border. The cross is worn on the left side of breast.
The current version was introduced by pope Paul VI and is only awarded in gold. The obverse depicts the ApostlesSaint Peter and Saint Paul in the centre of the cross. The inscription Pro Ecclesia is stamped on the left arm, Et Pontifice on the right. Three small crosses are situated at the end of the left, bottom and right cross arm. During the pontificat of Paul VI and John Paul II, the top arm of the cross carried the coat of arms of the reigning Pope and his name in Latin on the bottom cross arm. The decoration's ribbon shows is yellow and white: the colors of the Papacy. The design was modified under Benedict XVI: The individual coat of arms in the top arm of the decoration was replaced by a small cross while the coat of arms of the Holy See replaced the small cross on the bottom arm. The name of the reigning pope no longer appears on the front side.