In consequence of his professed attachment to the doctrines of Luther he was first imprisoned in the dungeons of Antvorskov and thence transferred, in the spring of 1525, to the Grey Friars' cloister at Viborg in Jutland, where he preached from his prison to the people assembled outside, till his prior, whom he won over to his views, permitted him to use the pulpit of the priory church.
At Viborg the seed sown by Tausen fell upon good soil.
In October 15 26 King Frederick I., during his visit to Aalborg, took Hans Tausen under his protection, appointed him one of his chaplains, and charged him to continue for a time "to preach the holy Gospel" to the citizens of Viborg, who were to be responsible for his safety, thus identifying himself with the new doctrines in direct contravention of the plain letter of his coronation oath.
He was also the first of the reformers who used Danish instead of Latin in the church services, the "Even song" he introduced at Viborg being of great beauty.
But he was stronger as a preacher and an agitator than as a writer, the pamphlets which he now issued from the press of his colleague the ex-priest Hans Vingaard, who settled down at Viborg as a printer, being little more than adaptations of Luther's opuscula.