General Notes

Alan; co-founder with his brother (Geoffrey) of Tupholme Abbey or Priory, Lincolnshire 1156-66, Judge of Court of Exchequer 1165, Justice of the forest in all England 1165-77, excommunicated by St Thomas a Becket 1166 for supporting Henry II in his insistence that clergy were subject to the ordinary law.  [Burke's Peerage]

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below copied from Ren Neville, johnneville data base on rootsweb.
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Some show Alan as the son of Gilbert de Neville born abt 1035 , brother of Gilbert de Neville born abt 1085 , (father of Geoffrey de Neville) and others show him as the son of Ernise de Neville or AErnisius de Neville and nephew to reported brother Gilbert de Neville born abt 1085. Others show him as a son of Ralph de Neville. Others show an Alan died 1190 as the son of Ernise. Some say he died in 1191, was a judge and show him as brother to Gilbert born 1035 (hardly think so with 156 years between dates) Seeminly Alan de Neville died 1190 is the son of Alan that say died about 1178 (perhaps)

There is evidently a witness list of one of Gilbert de Neville born 1035 charters that name his two younger sons William and Walter and include Alan de Neville son of Ernise.

One of Alans charters in Kirkstead abbey was reportedly witnessed by brother Gilbert and Gilberts son Geoffrey which would make him the son of Gilbert. Somehow I doubt the charter said brother Gilbert and son Geoffrey.

First cousin to Geoffrey of Burreth
1165-Judge of the Exchequer (Treasury)
1165-Judge of the Forests
Chief Justice of Forests throughout England under Henry II
Granted Savernake Forest in Wiltshire by Henry II

[Note that I have followed Burke's Peerage's ancestry, which has no "Ernise" de Neville, but has Alan d1190, son of Alan d1178 (however Alan d 1190 is not an ancestor of mine.]