This paper presents a research paper from the lexical semantics domain. The project aims to provide a complete conceptual description of the relation chief (establishing a hierarchy inside a group of humans or an organization). The second goal of the project is to define a trilingual lexicon, structured by domains, identifying this relation. For our purpose, we study linguistic data from monolingual and multilingual, parallel and comparable corpora, available in English, in French and in German. The corpora have been tagged, lemmatized and annotated for proper names. A multilingual base of lexico-syntactic patterns has been defined to automatically extract chief relation.