Decretals (Solitae)
Pope Innocent III's decretal letter to the Emperor of Constantinople on the relationship between papal and royal authority.
Chapter I (The Six Days of Creation)
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Verse 14: Let There Be Lights in the Firmament
— Quoted on the two great luminaries as Pontifical authority and royal power
"Pope Innocent III, writing to the Emperor of Constantinople, book I of the Decretals, title 33, chapter Solitae"