BERTIE. A very pretty tradition brings t\\Q Berties, at the time of the Saxon invasion, from Beviiland, in Prussia, toBertiestad, now Bersted, in Kent, where " one of our Saxon monarchs gave him a castle and town !" A Cottonian MS. makes one Leopold de Bertie (!) constable of Dover Castle in the time of King Ethelred, but his son of the same name, being out of favour at court, retired to France. From that country in the year 1154 his descendant came to England with Henry II., who restored to him his ancestral estate at Bersted. See Burke's Ext. Peerage.

Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.