Philipp von Zesen, also Filip Cösius or Caesius (originally Ph.
Caesien, Filip Zesen, Filip von Zesen, in Latin Philippus Caesius à Fürstenau, Philippus Caesius à Zesen) (8 October 1619 – 13 November 1689) was a German poet, hymnist and writer.
Some of his works are published under his pen name Ritterhold von Blauen.