[L, year of the world].
The year since the creation of the world, according to biblical revelation, abbreviated am. Medieval scholars were not uniform as to when this might have been. The Irish Annals of the Four Masters posited 5090 bc; e.g. 1000 bc would be 4090 am. The influential Anglo-Saxon historian the Venerable Bede (8th cent.) suggested 3952 bc. Also widely cited were 5200 bc and 5198 bc.