Herucalmo
From Tolkien Gateway
The consort to Tar-Vanimeldë, the third Ruling Queen of Númenor. The Queen had little interest in the duties of her office, and during her reign Herucalmo effectively acted as her regent. On Tar-Vanimeldë's death, the Sceptre should have passed to her son Alcarin, but instead Herucalmo withheld it and claimed the Kingship for himself, taking the name Tar-Anducal. The island of Númenor fell under his doubtful rule for twenty years, until Herucalmo himself died, and Alcarin took his rightful place.