The evolution of the European human rights regime is often described as the development of an integrated order with the European Convention of Human Rights as its governing ‘constitutional instrument’. It is argued that the regime is better regarded as pluralist - characterised by a heterarchical relationship between its constituent parts that is ultimately defined politically and not legally. The emergence and workings of this pluralist order are traced through the interaction of the European Court of Human Rights with domestic courts in the European Union. These cases not only show conflicts over questions of ultimate supremacy but also significant convergence and harmony in practice. The analysis of the factors leading to this convergence indicates that central characteristics of pluralism – incrementalism and the openness of ultimate authority – have contributed significantly to the generally smooth evolution of the European human rights regime. This suggests a broader appeal of pluralist models as alternatives to constitutionalism in the construction of postnational authority and law.