One of the mysteries of the English language finally explained.
Chiefly in predicative use, without article. A person or thing that is easily first; a person or thing considered to be the best or most notable; the acknowledged leader in a particular subject, field of expertise, etc.
Mid 17th century. From classical Latin facile princeps easily the best (Cicero) from facile easily, use as adverb of neuter of facilis + princeps.
facile princeps/ˈfakɪleɪ ˈprɪŋkɛps//ˈfasɪli ˈprɪnsɛps/
In this article we explore how to impress employers with a spot-on CV.