What is Mid Samonios?

From Wikipedia: "[T]he calendar year began with Samonios, which is usually assumed to correspond to Old Irish Samhain, giving an autumn start to the year. However, as Samon is Gaulish for summer (Lambert p.112), this assumed start is disputed."

From Lambert: La Langue Gauloise, p.111: Gaulish mid is 'month' (cf. Latin mensis, Greek μην (mēn), Breton miz, Irish mí, gen. mísa 'month').

So, it means "the month of Samnios".

Ceci n'est pas un seing.