1) Arthurian legend boy name 2) Latin phrase 
Latin, meaning: author, originator. 
Auctor is Latin for author or originator. The term is used in Scholasticism for a `renowned scholar`, and in alpha taxonomy for the scientist describing a species. The term is widely replaced by author in zoological nomenclature, but is still in use in botany.{cn|date=April 2013} Related to the notion of legitimacy on the basis of publication. O.....
author, originator.