facile princeps
/ˈfasɪli ˈprɪnsɛps/ /ˈfakɪleɪ ˈprɪŋkɛps/noun
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.
Origin
Mid 17th century. From classical Latin facile princeps easily the best (Cicero) from facile easily, use as adverb of neuter of facilis + princeps.