Count Karl von Arco was a minor Salzburg court official who achieved permanent historical fame through a single act: in June 1781, he kicked Mozart out of a door in Vienna, ending Mozart's employment in Salzburg and setting him free to become the composer who wrote Don Giovanni, the Jupiter Symphony, and the Requiem.
The Story
Arco was the chief steward of Archbishop Colloredo's household. In 1781, Mozart was in Vienna with the Archbishop's court and had been growing increasingly determined to resign. He had already received a letter dismissing him. When he appeared again to press the matter in person, Arco had him physically removed: "gave me a kick on my backside," as Mozart described it in a furious letter to his father written the following day.
It is worth noting that Arco was not simply a brute. Contemporary evidence suggests he tried to talk Mozart out of resigning and warned him about the risks of leaving without the Archbishop's formal blessing. The physical ejection, when it came, was likely an escalation of a tense confrontation rather than casual cruelty. It was also entirely within the period's norms for dealing with household servants, which is precisely what court musicians were.
What matters for Salzburg is what happened next. Mozart did not go back. He stayed in Vienna, where he would spend the rest of his life and write the works for which he is remembered. The kick on the backside at the Residenz in Vienna was the hinge. Arco, a man who otherwise left almost no mark on history, is the figure who held the door.
