Ockham’s early theory of concepts, often dubbed ‘the fictum theory’, was probably influenced in some measure by the work or at least the terminology of Peter Auriol. According to Ockham’s first account, a concept is an Aristotelian substance, but not a normal material substance, such as a human being, nor a nonmaterial substance, such as an angel – such beings can be the subjects of accidents and so could be said to have esse subjectivum (=subjective being) – rather, concepts are in an entirely different class of substances, which have the sort of existence in the mind that an object fashioned by thought has, to wit, esse objectivum (the being of a thought-object), or, as he sometimes says, a concept is a fictum (=a mentally-fashioned being).