Bibliographical sources mentioned in this text:
Becanus, Ioannis Goropius : Becceselana 66.14
Gerard, Ioannes 66.14
Guicciardini 66.13
Homerus 66.2
Leodius, Hubertus : About the Tungri and Eburones 66.14
Marselarius, Hadrianus is the person mentioned in the cartouche of this late Brabant map to whom this map has been dedicated, Ort66
Ortelius reporting on his visits to towers in Europe 66.20
Plinius 66.3
Servilius, Ioannes : Treatise about Guelders and Brabant 66.13, 66.20
Spiegelius, Iacobus : Letter to Guntherus of Genoa 66.2
Stella, Christoffel : Voyage of the Kings 66.20