Columbia subject headings:
Angels--Christianity--History of doctrines--16th century.
Diplomacy--History--16th century.
Diplomacy--Religious aspects--Christianity.
Mediation--Religious aspects--Christianity.
Harvard subject headings:
Angels--Christianity--History of doctrines--16th century.
Diplomacy--History--16th century.
Diplomacy--Religious aspects--Christianity
Mediation--Religious aspects--Christianity
Princeton subject headings: