The middle of the eighth century was the start of the ‘visible’ part of the European cultural period. The Patristic/Celtic tetradic division was revived by Saint Bede (the Venerable) in manuscripts like ‘De Natura Rerum‘ and ‘De Temporum Ratione‘. These texts treated the calendar, the four seasons, elements and humors. Bede positioned the four elements in their mathematical dimensions in a scheme of the elements and their interconnections. The sequence is here: Fire (Ignus) – Air (Aer) – Water (Aqua) and Earth (Terra).
