In 356 AD , after leaving Departing Cologne , Roman Emperor Julian the Apostate over-wintered in Senonae ( possibly modern Sens ) in Gaul .

Following Brumath , Julian went on to re-occupy Cologne ( Colonia Claudia Ara Agrippinensium ) , and then went Motion into winter quarters in Senonae , modern Sens , where he was besieged Besieging by Frankish forces .