After Julius Caesar captured Avaricum, he split his forces in half, and sent 4 legions under the command of Labienus north into the lands of the Senones and Parisii.
A Gaulish tribe known as the Parisii, who had cultural links to the continent, appeared in Northeast England.
Allied with the Germanic tribes of the east, they repeatedly engaged in warfare against the Parisii and the Senones.
He consolidated the forts, improved the road infrastructure and led some now well documented campaigns - firstly in 78 he reconquered North Wales, then in 79 conquered the Brigantes and also the Parisii of modern east Yorkshire, thus completing the annexation of what is now northern England.
The Île de la Cité has been inhabited since the 1st century BC, when it was occupied by the Parisii tribe of the Gauls.