Haren's best known work was an
epic poem,
Friso, written in 1741. He has also created
Het menschelijk leven, 1760, a review of his life and another epic poem:
Gevallen van Friso (Amsterdam, 1741), in which he describes the fate of the first king of the
Frisians. His brother, Onno Zwier van Haren, was also a poet and wrote patriotic verses. ==References==