Gissur Einarsson died in 1548 and Jón Arason took possession of the Skálholt diocese, even though the clergy opposed him. He also imprisoned Gissur's appointed successor. Jón Arason was consequently outlawed by the king, he was arrested with two of his sons, and all three were executed in November 1550. In 1552 the Hólar diocese also accepted the Church Ordinance. Institutional opposition to the Reformation had now vanished, so that church properties were secularised and churches and monasteries were plundered. However, it took many decades for Lutheranism to be firmly established in Iceland. Church manuals and hymnals were in bad Danish translations, and new schools had to be set up in cathedral towns to train the Lutheran clergy. Bishop Palladius was in charge of the development of the Icelandic Lutheran church in those early years. The able and energetic Gudbrandur Thorláksson, bishop of Hólar from 1571 to 1627, devoted his energies in improving church literature, clergy training and community education. In 1584 the first Icelandic translation of the Bible was published.