They found Conan’s hometown. ;)
There was a Conan I. Conan I. (The Crooked) Duke of Brittany was born about 944, in Rennes, Bretagne, France. He married Ermengarde d’Anjou in France. They had one child during their marriage. He died in 992 in Conquereuil, Pays de la Loire, France, at the age of 48.
A bit later on the timeline so probably not related to this massacre.