The original Conan story is set in the 4th century, but the earliest stories date from the 12th century. He settled Brittany/Armorica whilst fighting for the usurper Emporer Magnus Maximus. His name seems to relate to Conan the Barbarian (cutting down the men and cutting out the tongues of women) and Meriadoc Brandybuck the hobbit who swore to the House of Rohan. The House of Rohan were the Breton rulers who claimed descent from Conan. A coincidence?

https://en.wikipedia.org/wiki/Conan_Meriadoc