Columbia subject headings:
Christus vincit, Christus regnat, Christus imperat.
Kings and rulers.
Liturgies.
Rites and ceremonies.
Harvard subject headings:
Acclamations (Liturgy)
Christus vincit, Christus regnat, Christus imperat.
Liturgies.
Princeton subject headings:
Christus vincit, Christus regnat, Christus imperat.