Castel del Monte
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The number eight, a quadruplet peace sign and a sign of resurrection, is a common symbol in baptism, as can be seen in the octagonal baptistery introduced by the bishop of Milan, Ambrose, to emphasize in the ceremony of baptism the union of the infinite God with finite man.
Other octagonal geometries are found in the Mosque of Omar, or Dome of the Rock, seen by Frederick II during his visit to Jerusalem, the octagonal chapel of Aachen where Frederick was crowned emperor, the church of the Temple built in London in 1160.
Castel del Monte hides many secrets, but the only message visible to everybody is its geometry. The plan is octagonal, surrounded by eight octagonal towers, with eight rooms on the lower floor and as many upstairs, an octagonal courtyard in the center of which there was an octagonal pool.
The number returns many times in the Castle: 8 four-petal flowers on the right frame and as many on the left frame of the gable on the portal; 8 leaves on the capitals of all the columns of the ground floor and the first floor, 8 leaves on the keystone, 8 petals in the flower of the keystone, 8 vine leaves on the keystone of the first room on the ground floor, 8 sunflower leaves on the keystone of the fourth room, 8 leaves and 8 petals on the keystone to the fifth room, and so on.