 A poet of not inconsiderable talent, Valerius worked on the great Zeelander compendium "Zeeusche Nachtegael" with a number of other poet-colleagues.The work would be published in 1623.His primary individual opus, on the other hand, is the collection of folk poems and melodies on the Dutch Wars (1555–1625) "Nederlandtsche gedenck-clanck," which he had collected and edited for thirty years until his death in 1625.