As one of the four stars in the Keystone asterism (see yellow quadrangle) is one of the more easily recognized in the constellation.
Golden Quadrilateral | Quadrilateral | Saccheri quadrilateral |
Originally built as a standard VOC four bastioned quadrilateral fort, by the mid seventeenth century earthquakes, the tropical monsoonal climate, and poor original construction materials and techniques had resulted in the structure becoming dilapidated.
Eventually General Radetsky was forced to completely withdraw his troops from the two states, however, due to his expertise, he was able to keep the Quadrilateral fortresses of Verona, Peschiera, Legnano and Mantua.