Who sets the rules that govern us? For a large part of EU rulemaking the answer is the European Commission. The rules it adopts are contained in delegated and implementing acts. This raises the question of the relationship between us, the persons subject to these rules, and the commission as the rulemaker. What gives the Commission authority to govern over persons within the Member States? These questions are central to Eljalill Tauschinsky’s research. She approaches them in the light of fiduciary law and fiduciary relations, which are typically characterised by the requirement of binding the power holder to the interests of the subject of power in an open-ended way.