Abstract
To assess the utility of appeals to natural law as a way of projecting ethical claims across ideological and cultural boundaries, three examples of such appeals in just war theory are critically analyzed and evaluated: those of contemporary international lawyers Myres McDougal and Florentino Feliciano, theological ethicist Paul Ramsey, and Franciscus de Victoria, a sixteenth-century Spanish theorist whose recasting of Christian just war thought gave rise to secular international law. The conclusion is that natural-law appeals today can no longer depend on their own self-evidence, but must be attempts to uncover commonality as to what is natural