There isn't one, but multiple; The Norns are female entities
that rule over the destiny of men as well as other gods. Supposedly
the Norns appear when a person is born and determine that person's
entire future, good or bad.
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The three Fates,who between them weave the threads(individual
lives) into the Tapestry of life.They have but a single eye,which
they pass around.Harry Harrison and Kathleen Maclean wrote a
fascinating short sf story called "The Web of the Norns."