Wikipedia
The Thyamis , also known as Glykys (Γλυκύς) or Kalamas (Καλαμάς), is a river in the Epirus region of Greece. It flows into the Ionian Sea. The names of the Chameria region (Tsamouria in Greek), as well as the former Cham minority, derive from the river's name. Thyamis in ancient Greece was mentioned by Pausanias as forming the boundary between Thesprotis and Kestrine.
Some Renaissance scholars believed that the English River Thames owed its name to the River Thyamis, as early Celtic tribes were thought to have migrated from the Epirus region to England. While this belief influenced the modern spelling of the English river's name, it is no longer regarded as credible.
In Greek mythology, Thyamis was a commander, along with his brothers, the Cyraioi, who fought together with Deriades against Dionysus in the Indian War. He was son of Tarbelus and is mentioned in Nonnus Dionysiaka. Another individual named Thyamis was a warrior in the army of Dionysus during the Indian War. He was killed by King Deriades of India.