When the Lutheran Reformation was brought to Sweden from Germany via Denmark after the election of Gustav Vasa in 1523, the movement from the start had its own distinct characteristics. The development of Swedish liturgy was, in part, thanks to Olavus Petri, which is sometimes regarded as his most important work. His Swedish Mass, 1531 remained in use, with only slight modifications, until the twentieth century. The Swedish Mass draws from a number of different sources, though Luther’s "Formulae Missae" is apparent in regards to the Eucharistic structure This included revising the calendar along similar lines as those in Germany. Laurentius Petri further revised the Swedish Mass 1557. In large part, the Swedish liturgy retained “vestments, altars and frontals, gold and silver chalices and patens” and many other “popish” customs. Following Laurentius’ death in 1573, King John III embarked on a separate, though similar, religious policy more conciliatory towards Catholicism. 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.