The tradition of political reflection within Catholic thought, running from the church fathers through the medieval scholastics to the body of modern social teaching. Its distinguishing commitments are that political authority is natural rather than a consequence of sin alone, that it is answerable to a moral order it does not create, and that the person is prior to the state but constituted within community rather than against it.
Augustine set the terms by refusing to identify any earthly regime with the city of God. Aquinas gave the tradition its systematic form, grounding law in reason and the common good, and the School of Salamanca extended it to the rights of conquered peoples and the limits of just war. The modern phase begins with Leo XIII's Rerum Novarum (1891), which condemned both socialism and unrestrained liberal capitalism and defended a living wage and the right to organize; Pius XI's Quadragesimo Anno (1931) added subsidiarity, the principle that decisions belong at the lowest competent level, which has since passed well beyond Catholic usage.
The twentieth century pushed the tradition in several directions at once. Maritain argued that Christian personalism grounds human rights and helped shape the Universal Declaration; Christian democratic parties rebuilt post-war Europe on that basis; Vatican II and John Courtney Murray reconciled the church to religious liberty; and liberation theology in Latin America read the Exodus as a political text, drawing censure from Rome under John Paul II while reshaping the church's language about poverty. Laudato Si' (2015) extended the same framework to ecology.
The tradition sits athwart the left-right division rather than within it, which is its most distinctive feature and the source of its sharpest internal disputes: it is redistributive on economics and traditional on sexuality and life, and neither political coalition can adopt it whole. Its current fault line is between integralists, who hold that the state should be ordered to the church's ends, and the Murray-descended majority, who regard the liberal constitutional settlement as legitimate and worth defending.
