Incentives to attend parliament should have been common to both the French and the English nobility . Yet only the English nobility ended up being regularly involved in parliamentary proceedings. Their presence was fundamental for functional fusion and institutional layering to occur. Only where the nobility was compelled to attend parliament, especially in connection to its judicial functions, did the crown have a regular forum to raise taxation. Justice provided the regularity that taxation did not, allowing the institution to consolidate. Conversely, when the most powerful groups were regularly present in a central institution, they were able to solve their collective action problem and cooperate to oppose the crown. The chapter thus shows that the capacity of the English crown to compel nobles for judicial and political service was greater than that of France. The point is further established through the literature on Legal Origins, which explains the divergence of Common from Civil Law, as well as by an assessment of the remarkable level of conscription of English subjects to perform judicial functions that were disbursed by paid officials in France.