 One of the most important texts where Olivi deals with political philosophy is his Quid ponat ius (= Summa IV q. 1). His aim in this text is to provide a theoretical foundation for his discussion on the sacraments, and he considers it useful to start with a detailed analysis of the ontology of political power and property rights. Although it has been pointed out that Olivi seems to prefer a mixed form of government (Blythe 1992, pp. 151–52), this particular text does not aim at offering a political theory; it is a philosophical exercise in social ontology, which centers on a question concerning the ontological foundation of relational terms such as ‘right’ (ius), ‘authority’ (auctoritas), ‘power’ (potestas), ‘obligation’ (obligatio), and ‘property right’ (proprietas). (For discussion, see Piron 1996, 2016; Rode 2014, 2016; Toivanen 2016a.)