The oldest recorded use of the modern name is in a 1421 document, when king Alfonso IV of Aragon gave it (under the spelling Arsaghene) as a fief to Ramboldo de Cobaria.
The earliest known instance of the modern name's use is found in a 1421 document where King Alfonso IV of Aragon granted it (under the spelling Arsaghene) as a fief to Ramboldo de Cobaria.