Alan de Neville (Landholder)

Not the same person as Alan de Neville, Forester -- Alan de Neville

See https://en.wikipedia.org/wiki/Alan_de_Neville_(landholder) -- they give a precis of the possible Neville connections for this person; in short, several historians argue that he is the son of Alan de Neville, Forester.

Another argues that he is the brother of Gilbert de Neville.

One historian argues that he had sons; another that he had no children.

Juliana may or may not have been his wife.