In the 1520s, the Petri brothers led a campaign for the introduction of Lutheranism. The decade saw many events which can be seen as gradual introductions of Protestantism, for instance the marriage of Olaus Petri – a consecrated priest – and several texts published by him, advocating Lutheran dogmas. A translation of the New Testament had also been published in 1526. After the reformation, a full translation was published in 1540–41, called the Gustav Vasa Bible. However, knowledge of Greek and Hebrew among Swedish clergymen was not sufficient for a translation from the original sources; instead the work followed the German translation by Martin Luther in 1534.