Shakespeare, as a literary individual, was widely read, and would have had access to the chronicles (particularly Raphael Holinshed's (1529–1580), which provides the source material for a several plays) and translations of ancient classics that had been published in his day. The Mirror for Magistrates was a publication that contained the essentials of the tale of King Lear; that story reflects the actual history of the son of Charlemagne (742-814) splitting his kingdom among his sons.
Other sources include a chronicle published by William Strachey (1572-1621), who was attempting to sail to Bermuda in 1609, but was shipwrecked. Scholars conclude that Shakespeare used this source as a setting for The Tempest.
scholars have for generations brandished de Veres death date like a broadsward because they say plays like 'macbeth' and 'the tempest' were clearly written after 1604.but the evidence that places'the tempest' and its like afer 1604 ,is actually the kind of stuff dreams are made on .