When did bach start preforming in public?

Johann Sebastian Bach began performing in public during his early career in the late 17th century. His first significant public performances took place while he was in the service of Duke Wilhelm Ernst in Weimar, where he held the position of concertmaster starting in 1703. By the time he moved to Köthen in 1717, Bach was already well-established as a performer and composer, showcasing his music in various public and court settings.