Wikipedia
Cissonius (also Cisonius, Cesonius) was an ancient Gaulish/Celtic god. After Visucius, Cissonius was the most common name of the Gaulish/Celtic Mercury; around seventeen inscriptions dedicated to him extend from France and Southern Germany into Switzerland.
Cissonius was represented either as a bearded, helmeted man riding a ram and carrying a wine cup, or else as a young man with winged helmet and herald's staff accompanied by a rooster and goat.
The name has been interpreted as meaning "courageous", "remote" or else "carriage-driver". He was probably a god of trade and protector of travellers, since Mercury exercised similar functions in the Roman pantheon.
In one inscription from Promontogno in Switzerland, Cissonus is identified with Matutinus.
The name of Niederzissen, a village in northern Rhineland-Palatinate, may be derived from the name of Cissonius.
A goddess Cissonia is also recorded.