On the Kingdom of Christ
Martin Bucer's De Regno Christi stands as one of the most comprehensive attempts by a Protestant Reformer to envision how Christian faith should reshape civil society. Written in 1550 and dedicated to the young King Edward VI of England, this treatise emerged from Bucer's final years as Regius Professor of Divinity at Cambridge, where he had fled after the imperial victory over Protestant forces in Germany. Invited by Thomas Cranmer to help reform the English church, Bucer saw an unprecedented opportunity to influence a Protestant monarch and create a truly Christian commonwealth.
The work systematically argues that Christ's kingdom must manifest itself not only in individual hearts and church life, but in the structures of civil government, education, economic relations, and social welfare. Bucer develops a vision of Christian magistracy where rulers serve as God's ministers tasked with promoting both tables of the law—duties toward God and neighbor. He outlines specific reforms for marriage law, poor relief, education, and economic justice, all grounded in detailed biblical exegesis. Unlike more radical reformers, Bucer maintains the legitimacy of civil authority while insisting it must be transformed by Gospel principles. The treatise represents a middle path between Lutheran two-kingdoms theology and Anabaptist separation from worldly governance.
Though Edward's early death prevented implementation of Bucer's program, De Regno Christi profoundly influenced Reformed political thought and the development of Christian social teaching. Its integration of careful biblical interpretation with practical policy proposals established a template for Protestant thinking about faith and public life that shaped later Puritan political theory and colonial American experiments in Christian governance.
Who should read this: Readers interested in Reformed political theology, the relationship between church and state, or how the Protestant Reformation engaged questions of social reform will find this essential. Those seeking purely devotional or mystical spirituality should look elsewhere, as this is primarily a work of applied theology and political theory.