Tuesday [OE] The ancient Germanic god Tiw is the source of Tuesday. When Germanic peoples came into contact with the Romans they realized that their god Tiw was similar to Mars, the Roman god of war whose day was the third of the week (and who appears in forms such as the French Mardi), and started to call that day ‘Tiw’s day’ or Tuesday. Other days of the week were formed in a similar way, with Wednesday being Woden’s day, Thursday Thor’s day, and Friday Freya’s day; Woden or Odin was the supreme god of the German and Scandinavian peoples, Thor the god of thunder, and Freya or Frigga the goddess of love and fertility. Sunday and Monday refer to the sun and moon. See also saturnine.