Jake Zuehl

Can the existence of a social practice justify practical authority? A medieval debate between hierocrats and caesaropapists may help to illuminate this question. Focusing mainly on Marsilius of Padua, with reference to John of Paris, this article suggests that caesaropapists can be read as developing a 'practice conception' of the structure and scope of ecclesiastical authority. Because it brings the conflict over authority to a new battleground, the practice conception supplies caesaropapists with a source of dialectical leverage over hierocratic doctrine. The paper explores the strengths and limitations of this methodological approach and links it to debates in contemporary political thought.

Unrejectability is the property shared by things no one could reasonably reject. Following the lead of T. M. Scanlon, modern contractualists hold Principle Contractualism: An act is obligatory when conformity to unrejectable principles requires its performance. This article entertains Act Contractualism: An act is obligatory when its performance is unrejectable. The article hypothesizes that Principle Contractualism owes its initial plausibility to the assumption that following it somehow realizes unrejectability, if only indirectly. The article then argues that, whereas following Act Contractualism realizes unrejectability, following Principle Contractualism realizes a convoluted, principle-mediated, non-causal conformity relation between acts and unrejectability. But then the notion that this relation is what matters ultimately in action does not seem to enjoy independent plausibility. After interrogating Scanlon's objection that the challenge to the principle-based nature of contractualism is , I conclude that Act Contractualism is the more fitting contractualist theory of obligation