And 7 is the number of the days of the week (which are identified with the names of planets i.e. Sun, Moon, Mars, Mercury, Jove, Venus, Saturn). Commentaries on the Creation story in Genesis (Commentaries on the Hexaemeron) were written by several theologians and the idea of 7 days also got taken over into the genre of Universal Chronicles with their division into 7 ages or 6 ages and Eternity. Julia Barrow %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%