Jaap van Domselaer was a poet and the brother of his first wife Matie. He lived with the couple in their apartment in Amsterdam during the second World War. Jaap was shot dead by the Germans when he tried to escape the occupied territory crossing the rivers to the liberated south of Holland. Jaap introduced Constant to many of the philosophers that would proof influential in Constant's visions.
On the back: Voor Constantijn van Constant 31-8-1988 (To Constantijn from Constant 31-8-1988)