Valerian was historically spoken by the Valeri, an ancient Elaran race. Through the expansion and exploration of the world, Valerian spread throughout most of the planet. Other languages, such as Delsharan, are descended from Valerian, with obvious lingual shifts and grammatical alterations due to cultural, regional, and geographic differences over a long period of time.
Currently, Delsharan is considered the "Old Tongue," as Common speech has followed it (much like Delsharan followed Valerian). Whenever Valerian is encountered (and almost never translated), it is called the "Ancient Tongue" or the "language of the Ancients."
more to come...