Also he painted a work for the Janskerk (Gouda) called De onthoofding van Saint-Jacob, now in the museum there.

In 1572, Blocklandt made a trip to Italy, after which he settled for good in Utrecht, joining a guild there in 1577.

In 1579, he painted his best known work, the triptych The Assumption of Mary that is now in the Basilica of St. Martin in Bingen am Rhein.

According to Carel van Mander, Blocklandt painted biblical scenes, mythological subjects and portraits.

[1] Van Mander wrote that De Beer had many paintings by Blocklandt in his workshop that his pupil Abraham Bloemaert later copied.