In 1955 Pope Pius XII made several changes to the General Roman Calendar of 1954, changes that remained in force only until 1960, when Pope John XXIII, on the basis of further recommendations of the commission that Pius XII had set up, decreed a further revision of the Roman Catholic calendar of saints (see General Roman Calendar of 1962). The changes made by Pope Pius XII thus remained unaltered for only five years. He made the following changes by the decree "Cum nostra hac aetate" (De rubricis ad simpliciorem formam redigendis) of March 23, 1955