Martin Janus – Wikipedia

Martin Janus (also Martin Jahn, Jähn and Jan; c. 1620 – c. 1682) was a German Protestant minister, church musician, hymnwriter, teacher and editor.He wrote the lyrics of the hymn “Jesu, meiner Seelen Wonne”, which became popular in the arrangement of a Bach chorale as Jesu, Joy of Man’s Desiring

https://en.wikipedia.org/wiki/Martin_Janus