• Stevin (+++) (obtuse)

    In Stevin's hexagonal design, the distance between the points of the two bastions is 1237 feet (about 100 rods or 3800 meters). The bastion angle is obtuse. The length of the line of defense is 968 feet (about 81 rods or 300 meters). This design is larger than a Great Royal.

    Simon Stevin: Sterctenbovwing 1594
  • Errard (++) (90°)

    In Errard's hexagonal design, the distance between the points of the two bastions is 130 toises (65 rods or 245 meters). The bastion angle is right. The length of the line of defense is 100 toises (50 rods or 188 meters). This design is a Mean Royal.

    Jean Errard: Fortification réduite en art et démontrée 1600
  • Marolois (+) (½+15°)

    In the pentagonal fortress of Marolois, the distance between the points of the two bastions is 63 verges (63 rods or 237 meters). The bastion angle is 69°, which is 15° more than half of the polygon angle. The length of the line of defense is 47 verges (47 rods or 177 meters). So, this is a little bit more than a Small Royal fortification.

    Samuel Marolois : Fortification ou architectvre militaire 1614
  • Marolois (++) (½+15°)

    In the hexagonal design of Marolois, the distance between the points of the two bastions is 70 rods (264 meters). The bastion angle is 69°, which is 15° more than half of the polygon angle. The length of the line of defense is 53 rods (200 meters). This is a Mean Royal fort.

    Samuel Marolois : Fortification ou architectvre militaire 1614
  • Henrion (+++) (½+15°)

    Depending upon the number of bastions, the distance between the points of the two bastions is around 160 toises (80 rods or 300 meters). The bastion angle is 15° more than half of the polygon angle. The length of the line of defense is around 120 toises (60 rods or 226 meters). So, this is a Great Royal design.

    Pentagonal design
    Didier Henrion: Construire les Fortifications pratiquess aux Pays Bas 1621
  • Henrion (2) (+++) (½+15°)

    For a hexagon, the distance between the points of the two bastions AB is around 149 toises (74 rods or 280 meters). The bastion angle is 15° more than half of the polygon angle. The length of the line of defense AI is around 114 toises (57 rods or 215 meters). This is the design of a Great Royal.

    Didier Henrion: Construire les Fortifications pratiquess aux Pays Bas 1621
  • Schooten Sr BPL1013 (+) (½+15°)

    In BPL 1013, Frans van Schooten Sr did not mention computational results. He assumes that the distance between the points of the two bastions is 60 rods (226 meters). The bastion angle is 15° more than half of the polygon angle. So, the design is a Small Royal.

    Frans van Schooten Sr: BPL 1013 1622
  • Hondius (+++) (½+20°)

    For a pentagon, the distance between the points of the two bastions is 93 rods (350 meters). The bastion angle is almost 20° more than half of the polygon angle. The length of the line of defense is 67 rods (254 meters). So, the design is a Great Royal.

    Henricus Hondius, Korte beschrijvinge, ende afbeeldinge van de generale regelen der fortificatie 1624
  • Metius (++) (⅔)

    In the hexagonal design of Metius, the distance between the points of the two bastions is 65 rods (245 meters). The bastion angle is two-thirds of the polygon angle, but 90° at most. The length of the line of defense is 47 rods (177 meters). So, this is Mean Royal design.

    Adriaan Metius: Fortificatie ofte stercken-bouwinghe 1626
  • De Ville (+++) (90°)

    In the hexagonal design of De Ville, the distance between the points of the two bastions is 240 steps (80 rods or 300 meters). The bastion angle is a right angle. The line of defense is 180 steps (60 rods or 226 meters). So, this is a Great Royal design.

    Antoine de Ville: Les fortifications du chevalier Antoine de Ville 1628
  • Freitag (+++) (½+20°)

    In the pentagonal design of Freitag, the distance between the points of the two bastions is 82 rods (310 meters). The bastion angle is 20° more than half of the polygon angle. The length of the line of defense is 61 rods (230 meters). So, this is a Great Royal design.

    Adam Freitag: Architectura militaris nova et aucta 1635
  • Kinckhuysen (+) (⅓+30°)

    In the pentagonal design of Kinckhuysen, the distance between the points of the two bastions is 62 rods (234 meters). The bastion angle is is 30° more than one-thirds of the polygon angle. The length of the line of defense is 46 rods (173 meters). So, this is a Small Royal design.

    Gerard Kinckhuysen: De Theorie der Fortificatie ofte Sterck Bovwinge 1640
  • Cellarius (+++) (⅔)

    The distance between the points of the two bastions is around 80 rods (300 meters). The bastion angle is two-thirds of the polygon angle. The length of the line of defense is around 60 rods (226 meters). So, this is a Great Royal design.

    Andreas Cellarius: Architectvra Militaris 1645
  • Goldmann (+++) (½+15°)

    In the pentagonal design of Goldmann, the distance between the points of the two bastions is around 77 rods (290 meters). The bastion angle is 15° more than half of the polygon angle The length of the line of defense is around 60 rods (226 meters). So, this is a Great Royal design.

    Nicolaus Goldmann: La nouvelle fortification 1645
  • Melder (+++) (± ½+15°)

    In the pentagonal design of Melder, the distance between the points of the two bastions is around 85 rods (320 meters). The bastion angle is about 15° more than half of the polygon angle. The length of the line of defense is around 63 rods (238 meters). Therefore, this design is a Great Royal.

    Gerard Melder: Korte en klare instructie van regulare en irregulare fortificatie 1651
  • Ruse (+++) (± ½+15°)

    The distance between the points of the two bastions is around 80 rods (300 meters). The bastion angle is about 15° more than half of the polygon angle. The length of the line of defense is 59 rods (222 meters). So, this is a Great Royal.

    Henrik Ruse: Versterckte Vesting 1654
  • Kechelius (+++) (½+15°)

    In the pentagonal design of Kechelius, the distance between the points of the two bastions is around 81 rods (306 meters). The bastion angle is 15° more than half of the polygon angle. The length of the line of defense is 61 rods (230 meters). So, this is a Great Royal design.

    Samuel Kechelius: BPL 1351 1655
  • Pieter v Sch. BPL 1993 (+) (⅓+30°)

    In this pentagonal design, the distance between the points of the two bastions is 60 rods (226 meters). The bastion angle is 15° more than half of the polygon angle. The length of the line of defense is 45 rods (170 meters). This is typically a Small Royal design.

    Pieter van Schooten: BPL 1993date unknown
  • Pieter v Sch. HS441 (+) (⅓+30°)

    In this pentagonal design, the distance between the points of the two bastions is 60 rods (226 meters). The bastion angle is 30° more than one-thirds of the polygon angle. The length of the line of defense is 45 rods (170 meters). This is typically a Small Royal design.

    Pieter van Schooten: HS 441 1656
  • Tresoar (+) (⅓+30°)

    In this pentagonal design, the distance between the points of the two bastions is 60 rods (226 meters). The bastion angle is 30° more than one-thirds of the polygon angle. The length of the line of defense is 45 rods (170 meters). This is typically a Small Royal design.

    Anonymus (Tresoar): anonymus date unknown
  • KW1900A242 (+) (⅓+30°)

    In this pentagonal design, the distance between the points of the two bastions is 60 rods (226 meters). The bastion angle is 30° more than one-thirds of the polygon angle. The length of the line of defense is 45 rods (170 meters). This is typically a Small Royal fortification

    Anonymus (Koninklijke Bibliotheek): KW1900A242 date unknown
  • Huygens HUG16 (+) (⅓+30°)

    In this pentagonal design, the distance between the points of the two bastions is 60 rods (226 meters). The bastion angle is 30° more than one-thirds of the polygon angle. The length of the line of defense is 45 rods (170 meters). This is typically a Small Royal design.

    Christiaan Huygens: HUG 16 ±1650
  • Cuyck van Meteren (+) (⅓+30°)

    In this pentagonal design, the distance between the points of the two bastions of a hexagon is 60 rods (226 meters). The bastion angle is 30° more than one-thirds of the polygon angle. The length of the line of defense is 45 rods (170 meters). So, this is a Small Royal design.

    Adriaan Cuijck van Meteren: BPL 3457 date unknown
  • Lombaerde (14) (+++) (½+15°)

    In this pentagonal design, tThe distance between the points of the two bastions is 81 rods (306 meters). The bastion angle is 15° more than half of the polygon angle. The length of the line of defense is 60 rods (226 meters). This is typically a Great Royal design.

    Anonymus (Lombaerde): date unknown
  • Lombaerde (15) (+) (½+15°)

    In this pentagonal design, the distance between the points of the two bastions is 60 rods (226 meters). The bastion angle is 15° more than half of the polygon angle. The length of the line of defense is 45 rods (170 meters). This is typically a Small Royal design.

    Anonymus (Lombaerde): date unknown