Johann Christoph Altnickol (1720-1759) was J.S. Bach’s musical son-in-law. A student of theology at the University of Leipzig, he also sang in Bach’s choirs. He married Bach’s daughter, Elisabeth Juliane Friederica in January 1749; their first son, Johann Sebastian, died in infancy.
Altnickol, an organist and composer, also acted as a copyist for his father-in-law. Following Bach’s death, he was named a trustee in the distribution of the Bach estate.