Leonard Junior’s birth date is uncertain, but it is believed to be c1649. As the grandson of Peter Millett, a capital inhabitant of the Marazion, it is perhaps no surprise that he was elected Mayor of the town. Records of the dates vary but a roll of Mayors of Marazion displayed in the town’s council chamber, shows Leonard Millett serving in the years 1679 and 1683.
In 1663 Leonard married Wilmot Dunstan.
Leonard died in 1686 and was buried at St. Hilary.