West Saxon dialect
West Saxon was one of four distinct dialects of Old English. The three others were Kentish, Mercian and Northumbrian (the latter two were similar and are known as the Anglian dialects). West Saxon was the language of the kingdom of Wessex, and was the basis for successive widely used literary forms of Old English: the Early West Saxon of Alfred the Great's time, and the Late West Saxon of the late 10th and 11th centuries.
Early West Saxon
Early West Saxon was the language employed by King Alfred (849–899), used in the many literary translations produced under Alfred's patronage (and some by Alfred himself). It is often referred to as Alfredian Old English, or Alfredian. The language of these texts nonetheless sometimes reflects the influence of other dialects besides that of Wessex.
Late West Saxon
By the eleventh century, the Alfredian language had been replaced by Late West Saxon. following the Athewoldian language reform set in train by Bishop Æthelwold of Winchester. The name most associated with that reform is that of Abbot Ælfric of Eynsham, Ælfric the Grammarian. Despite their similarities, Late West Saxon is not considered to be a direct descendant of Early West Saxon.