 The name comes from the Latin , sometimes associated with the Gallo-Roman goddess of the river.The word seems to derive from the same root as Latin "sequor" (I follow) and English "sequence", namely Proto-Indo-European "*seikw-", signifying 'to flow' or 'to pour forth'.On 28 or 29 March, 845, an army of Vikings led by a chieftain named Reginherus, which is possibly another name for Ragnar Lothbrok, sailed up the River Seine with siege towers and sacked Paris.