Giacomo Grimaldi (November 1568 – 7 January 1623) was an Italian historian and Vatican archivist, who lived in the early 17th century.
[1] His principal surviving works deal with the Roman Catholic Church.
[2][3] He is also notable for saving Pope Urban VI's remains from being discarded in 1606 and his sarcophagus used for a water trough.
[4] Many of his drawings were copied and published by Giovanni Giustino Ciampini in his book "De sacris aedificiis a Constantino Magno constructis", published in 1693.
Media related to Giacomo Grimaldi at Wikimedia Commons