Muus Jacobse (Klaas Hanzen Heeroma) (Hoorn (Terschelling), October 13 1909 - Groningen, November 21 1972) was a Dutch poet and linguist. Heeroma wrote under the pseudonym Muus Jacobse, the name of one of his ancestors on his mother's side that fisherman on the island of Marken had been. (HYMNARY.ORG)