“The Honour Castle of Richmond”. British History (1 March 2016). 12 January 2019閲覧。 “The date of the grant is uncertain, and no charter remains to bear witness to it. The most likely date in that case would seem to be 1069, when Edwin was still living ... If the evidence of the so-called charter is inaccurate on this point as on others the grant may have been delayed until after the death of Edwin in 1071.”
doi.org
"Eadwine, earl of Mercia" (d. 1071): doi:10.1093/ref:odnb/52351 in Ann Williams, ‘Ælfgar, earl of Mercia (d. 1062?)’, Oxford Dictionary of National Biography, Oxford University Press, 2004 accessed 18 April 2008
oxforddnb.com
"Eadwine, earl of Mercia" (d. 1071): doi:10.1093/ref:odnb/52351 in Ann Williams, ‘Ælfgar, earl of Mercia (d. 1062?)’, Oxford Dictionary of National Biography, Oxford University Press, 2004 accessed 18 April 2008
