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Why did Desiderius Erasmus leave Basel for Freiburg im Breisgau in 1529?

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Portrait of Desiderius Erasmus, shown in dark robes and cap, writing with a quill at a desk, after Quinten Massijs, oil on panel, Rijksmuseum, Amsterdam. — Erasmus Dutch humanist Desiderius Erasmus.

Desiderius Erasmus left Basel for Freiburg im Breisgau in 1529 because the city of Basel officially banned Catholic worship that year. As a scholar who valued the unity of the church and sought to avoid the destructive nature of religious conflict, Erasmus moved to the Catholic university town of Freiburg along with several of his humanist friends to escape the changing religious environment in Basel.12