Peter Martyr Vermigli played a key role in developing and formulating the Reformational version of the political covenant for legitimating the political order. Three important perspectives shaped Vermigli’s covenantal views: first, St. John Chrysostom’s idea of political office; second, Luther’s work on the divine origin of magisterial government and third, Heinrich Bullinger’s commentaries on the Biblical covenant. These perspectives were integrated by Vermigli into an influential paradigm of covenantal politics. The impact of the ideas emanating from Vermigli’s theologico-political federalism was not limited to the 16th-century Reformation, but also exerted considerable influence on the development of political contractarianism in 17th - and 18th-century liberalism. In this contribution the emphasis is on Chrysostom’s and Luther’s contributions to Vermigli’s political theology.