The Coucher Book of Whalley written by the 13th century Abbots at Whalley monastery recorded de Mitton genelogy from the early middle- ages (12th century) and has been relied on.
The Reverend George Ackerley’s book The History of the Parrish of Mitton (pub. 1947) has both the early “de Mitton” family and the Shireburne genealogy. I suspect Ackerley relied on records at Stonyhurst albeit with some mistakes.
The 1974 genealogy by Daniel Sommerfeldt of York, British Columbia also has a good genealogy back to the late 16th century. That same genealogy of the Craven Mittons can be found at: http://familytreemaker.genealogy.com/users/c/u/n/LindaHCunningham/GENE4-0001.html.
The most complete detailed genealogy is The Mittons of Craven by Jack Knowles (1982). It is found at the British Library in London as well as some other British librarys. Knowles claims that his record of descent from Richard Mitton born in 1577 is an authenticated genealogy. In other words the source documentation is taken from the Bishops Rolls transcripts.
The Knowles 1982 genealogy dates from the early 12th century starting with Robert de Lacy through the late 14th as de Mitton scion descendent’s of the de Lacy`s and then an authenticated 16th. to 20th century genealogy of those from the Craven area. Jack Knowles research was in England so it included ‘Squire’ Joseph Mitton from Horton – in – Ribbelsdale (1723-92).
This Joesph Mitton ties in precisely to Edmund Mittons 1906 Canadian genealogy. He documents “Squire” Joesph Mitton sons and grandsons from Horton in Ribbelsdale and those who immigrated to Newfoundland and Ontario in the late 18th and early 19th century. The genealogy record was further extended through the US line by Manley H. Mitton. He was Edmund Mittons grandson and wrote and compiled his genealogy based on his grandfathers primary document from 1906.
* First initiated in 1538 the Bishops’ transcripts were copies made from Parish records by the officiating clergyman of births, marriages and deaths that were sent to his bishop.
Please click book photo for close up magnification of early genealogy
The early Norman de Mitton genealogy is recorded in the Coucher book of Whalley in Vol. lll, page 680 above. This is a transcribed genealogy from the Latin first recorded by the Abbott’s of Whalley Abbey in the 13th century. Many other citing`s regarding the de Lacy, de Mitton, de Bailey and Shireburne families are found in these volumes.
Thus the de Mitton to Mitton genealogize documentation comes from authenticate primary sources as well as the Bishops rolls and the eary genealogy documenting by the Whalley Abby monks from the 12th. century.