The portrait was made to be engraved .
The portrait was included in van Dyck 's Iconography ( Icones Principum Virorum ) , a collection of engraved portraits of leading personalities of van Dyck 's time .
The portrait was made to be engraved and included in van Dyck 's Iconography ( Icones Principum Virorum ) , a collection of engraved portraits of leading personalities of van Dyck 's time .