On Ancestry, I have found a tree that traces from one of my ancestors back to 1465. The person's name at that point is John Tilston (1465-1506). The tree I was using asserted that John's father was Thomas Tilston (1443-1548) and his mother Elizabeth Heath (b 1443). The family were from Tilston, Cheshire, England. Thomas Tilston did indeed exist and was married to Elizabeth Heath. They had a son Richard (b circa 1477). The Tilston family is notable, and can be traced back to the time of William the Conqueror. A few trees in Ancestry have quoted the link between John and Thomas, Elizabeth and Richard, but I can't find any source references for this assertion. Wikipedia has the root of the Tilston Family (Eynion de Tilston b 1126) and Geni has a tree that starts with him and works forward to Richard.
Obviously proving a link to this family would be brilliant, but I am sceptical of the research the tree owner had done.