Chlothar I
Bertachar had at least one daughter and, depending on the source, one or several sons. His sons are unnamed. His daughter, Radegund, married the Frankish king Chlothar I and founded Holy Cross Abbey in Poitiers. She is revered as a saint in the Catholic Church. Two hagiographies of her were produced by her friends Baudovinia and Venantius Fortunatus. Fortunatus specifies that she was "from the Thuringian region", a daughter of King Bertachar and a granddaughter of King Bisinus.