Golden ratio
Přemyslid dynasty mausoleum has huge significance and its architectural quality is higher than in other parts of the convent. A nave with two bays of groin vault and a pentagonal end was done by an unknown French master. There was also a crypt within the mausoleum. It had pentagonal end, barrel vault and a staircase by the southern wall. The nave is connected with the chapel of Virgin Mary by a triumphal arch, which was built after the church was finished. Instead of capitals, heads of five Bohemian rulers and their wives are used. Agnes is portrayed on a capital just above the altar. The triumphal arch was constructed in the Golden section, using the 1: ratio. Inner geometrical structure then defined significant places and was visible mainly on a 3D decor. For example, the heads instead of capitals are placed on the archivolt of the triumphal arch and also on the top of the Golden ratio square.