The Old English Promissio regis is a translation of the threefold promise made at their coronations by Anglo-Saxon kings in the tenth and eleventh centuries followed by two paragraphs on the duties of kingship; it is preserved in one eleventh-century manuscript and we have two copies of a second. This article reviews discussions of the text, looks at the manuscript evidence for what it can tell about its authorship and history, examines its sources and function and suggests a close connection with Wulfstan, archbishop of York. A new edition of the text concludes the piece.