In 1884, Joachim and his wife separated after he became convinced that she was having an affair with the publisher Fritz Simrock. Brahms, certain that Joachim's suspicions were groundless, wrote a sympathetic letter to Amalie, which she later produced as evidence in Joachim's divorce proceeding against her. This led to a cooling of Brahms' and Joachim's friendship, which was not restored until some years later, when Brahms composed the Double Concerto in A minor for violin and cello, Op. 102, 1887, as a peace offering to his old friend. It was co-dedicated to the first performers, Joachim and Robert Hausmann.