According to the latest research findings, Treis had its first documentary mention in 762 as trisgodros villa publica. The document in question is actually a 10th-century copy in Prüm Abbey’s Liber aureus. There were holdings at Treis owned by Polish queen Richeza, Count Palatine Ezzo’s daughter, who apparently donated her property in 1051 and 1056 to the Brauweiler Monastery near Cologne. Beginning in the 11th century, Saint Castor’s Foundation (Stift St. Kastor) in Karden had, by way of donations and purchases, important landholdings. In 1103, Ravengiersburg Monastery obtained by way of trade with St. Stephan in Mainz an estate in Treis (curtis in Tris). The name Karden is a modern form of the name for a Roman vicus, named in the latter half of the 5th century as Cardena by the geographer of Ravenna. In the late 6th century, Karden was the centre of a greater parish out of whose college of priests arose Saint Castor’s Foundation in the 9th century. In 926, an exchange agreement contained the reference in Karadone, and in the 11th century, Karden was named as villa Cardiniacus[