Who sold indulgences that martin Luther didn't like was?

The sale of indulgences that Martin Luther opposed was primarily associated with Johann Tetzel, a Dominican friar. Tetzel's aggressive marketing of indulgences in the early 16th century, particularly his famous phrase "As soon as a coin in the coffer rings, the soul from purgatory springs," highlighted the corruption Luther condemned. This practice contributed to Luther's 95 Theses, which criticized the Church's exploitation of believers and sparked the Protestant Reformation.