William Camden
William Camden published Britannia in 1722.
William Camden's Britannia formed the basis on what the origins of the de Vere family are made.
My source text for the history of the region is Thomas Wright's History and Topography of Essex. Thomas Wright was a founder of the Camden Society. Wright seems to have based a lot of his earlier history on the work of Camden. The origins of the de Vere family were probably taken from Camden.
The Wikipedia page said: