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 antiquity and in the Middle Ages, Karden was a place of importance whose history was defined by the collegiate foundation that existed here until 1802.

The municipal election held on 7 June 2009 yielded the following results:[4] Since 2019, Hans-Josef Bleser (CDU) is Treis-Karden's mayor.

The lily appears in the seal of the Collegiate Foundation in Karden from the latter half of the 13th century; it also refers to Mary, the church's former patron.

It can be found on several tomb slabs and the winged altar in the Foundation church, as well as on the door lintel of the so-called Burghaus.

In 1977, municipal council commissioned heraldic artist A. Friderichs and local historian H. Ritter to submit designs for a coat of arms.

At a session on 18 July of that year, council chose the design that the municipality now bears as its arms, although they insisted on a slight modification to the charge in the second quartering, which was originally to have been an amphora.