The territory Mug Ruith received for his descendants was Fir Maige Féne, later known as Fermoy.
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Some say he lived during the reign of 3rd century High King Cormac mac Airt, while others put him in Jerusalem during the time of Christ.
In Irish mythology, Mug Ruith is said to have been a student of Simon Magus, who taught him his magic skills and helped him build the flying machine roth rámach.