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The Copernican revolution overthrew a medieval cosmology with a tidier celestial hierarchy than our own.

A chief angel; one high in the celestial hierarchy.

The pure spirits composed the nine choirs of the celestial hierarchy.

It was believed that there was a celestial hierarchy, with heavenly hosts in specific places.

Some of them might be set apart as the special servants and messengers of the gods, and occupy the place of archangels in the celestial hierarchy.