 Much of his work was in the area of liturgy and his "Nova Ordinantia" reinstated much of the sanctoral cycle from the Old Swedish Mass, reviving the feasts of St. Mary Magdalene, St. Lawrence, Corpus Christi, and the Assumption and Nativity of the Virgin Mary.Many of John’s reforms were controversial.The majority of calendars between the start of the Reformation and the 20th century were quite minimal in their commemorations.