German Photographer, (19th century). Medium: black and white photograph. Date: 19th Century. Liebknecht (1826-1900) (2nd from R) was a German social democrat, one of the founders of the SPD and father of Karl Liebknecht (1871-1919) (middle) also a German socialist and co-founder of the Communist Party of Germany; Provenance: Private Collection. Photographic rights held by The Bridgeman Art Library.