Nennius
Nennius, a Welsh historian of the late eighth century. He generally is creditied with writing Historia Britonum, which may be a revision of a work taken from several sources. This Latin work on the history and geography of Britain is remarkable chiefly for its account of the 12 battles of King Arthur. The first printed version appeared in 1691. Nennius is said to have been a monk who lived on the borders of the kingdom of Mercia.