Regent
Regent was a title given to one who ruled on behalf of another (usually a monarch), typically because the actual ruler had not reached maturity, or was absent or infirm. 

In 2267, a power struggle fomented by a Klingon agent left Leonard James Akaar as hereditary High Teer of the Ten Tribes from the time he was just hours old, following his father's death. His mother Eleen ruled as his regent, and signed a mining treaty with the Federation. ()

Palamar was led by a regent during the 2370s. () The Evora were led by Regent Cuzar in 2375. ()

In the mirror universe, the regent was the ruler of the Klingon-Cardassian Alliance.  was the Klingon regent in the 2370s. ()

Oxilon was the Council Regent of the Talaxians encountered by the  in 2378. ()

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Titles
Mirror universe