This is the first I have ever heard of the Arpitan language. This segment is the Evolénard dialect spoken in the Valais region of Switzerland. This language sounds completely strange to me. Every now and then, it sounds something like French, but mostly it’s just sui generis. I could not pick up one word of this.
Arpitan split from proto-langue d’oil around 800-900. This is really the intermediate langue between North Gallo-Romance and South Gallo-Romance.
What is Gallo-Romance? Gallo-Romance is that branch of Romance that is derived from the Vulgar Latin that arose from Gaullic speaking regions. The north went to the langues d’oil and French. Langues d’oil started to split around 900 or so. The south went to Rhaetian in the Alps -Romansch and Ladin and the Gallo-Romance languages of northern Italy. It is true – the Italian languages of northern Italy are closer to French than they are to Italian.
Arpitan is said to retain a strong resemblance to Latin itself – it is very archaic.