Which preposition to use with illuminators

of Occurrences 4%

It is the school of the soul, the illuminator of the meaning and discipline of life.

during Occurrences 1%

The reference here is to the famous monastery of St. John the Baptist, which was built by Gregory the Illuminator during the fourth century, on the mountain of Kark, near the Euphrates, on a spot where heathen altars had previously stood.

Which preposition to use with  illuminators