O'Donovan & O'Donovan, From Irenaeus to Grotius: A sourcebook in Christian political thought 100 – 1625 (2000).
More than sixty authors from the second to seventeenth centuries are represented. The editors also provide introductory essays, placing each author in historical and theoretical context. Some of the excerpts are available only in this resource. Its breadth and depth are remarkable. Scripture Index, 838 pages.