Before the 11th century, Swedes adhered to Norse paganism, worshiping Æsir gods, with its centre at the Temple in Uppsala. With Christianisation in the 11th century, the laws of the country changed, forbidding worship of other deities until the late 19th century. After the Protestant Reformation in the 1530s, a change led by Martin Luther's Swedish associate Olaus Petri, the authority of the Roman Catholic Church was abolished and Lutheranism became widespread. Adoption of Lutheranism was completed by the Uppsala Synod of 1593, and it became the official religion. During the era following the Reformation, usually known as the period of Lutheran orthodoxy, small groups of non-Lutherans, especially Calvinist Dutchmen, the Moravian Church and French Huguenots played a significant role in trade and industry, and were quietly tolerated as long as they kept a low religious profile. The Sami originally had their own shamanistic religion, but they were converted to Lutheranism by Swedish missionaries in the 17th and 18th centuries.