A person or entity that converts or adapts something to follow Gregorian principles, standards, or traditions.
From 'gregorianize' plus the agent suffix '-er,' creating a noun for one who performs the action of gregorianization or reform according to Gregorian standards.
Behind every major historical shift—like calendar reform affecting billions—were gregorianizers, the often-forgotten administrators who had to convince people that their dates were 'wrong' and needed changing.
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