Regent of Gondor
Regent, a translation of the Elvish term Karma-kundo which means "Guardian of the Helm", that was applied to those granted executive authority in place of a legitimate reigning King of Gondor. In all the history of the South-kingdom, only one Regent of this kind was ever appointed, Minalcar son of Calmacil.
Minalcar was the grandson of Atanatar II Alcarin, and already in the closing years of his grandfather's rule, he had become a forceful presence in the councils of the King, especially since neither of Atanatar's sons, Narmacil nor Calmacil, showed great interest in affairs of state. Just a few short years after Narmacil succeeded his father as King, he conferred the office of Karma-kundo on his nephew Minalcar, who from that point effectively ruled Gondor, though officially doing so in the King's name.
Minalcar would eventually ascend to the throne of Gondor himself under his better-known name Rómendacil II. Before doing so, though, he was Gondor's Regent for no less than sixty-four years.