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In page Albert of Brandenburg:

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The Market Church of Our Lady in Halle, which had been built to defend against the spread of Reformation sympathies,[citation needed] was the spot where Justus Jonas officially introduced the Reformation into Halle with his Good Friday sermon in 1541. The service must have been at least partly conducted in the open air, because at that time construction had only been finished at the eastern end of the nave. Jonas began a successful preaching crusade and attracted so many people that the church overflowed. Albert left the town permanently after the estates in the city had announced that they would take over his enormous debt at the bank of Jakob Fugger. Halle became Protestant and in 1542 Jonas was appointed as priest to St. Mary's and, in 1544, bishop over the city.[citation needed]