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Cersei Lannister's regency of her son, Joffrey Baratheon, ended upon his marriage to Margaery Tyrell.

"You're serving as Hand of the King till Father gets here. I am Queen Regent!"
Cersei Lannister to her brother, Tyrion[src]

Regent is the title held by a noble who rules in the name of a king, queen, lord or lady, because the rightful ruler is a child, incapacitated, or otherwise incapable of ruling with any degree of force. When ruling in the name of a child, a regent's rule ends when the child heir reaches adulthood. In the Seven Kingdoms, the legal age of adulthood is 16 years old. When a regent rules in the name of the King of the Andals and the First Men, he or she may also hold the title of Protector of the Realm. A royal regent also holds a seat in the small council, taking the place of the young monarch. While a regent functionally rules in place of an underage monarch, only the actual ruler and the Hand of the King may sit on the Iron Throne itself. For this reason, Queen Regent Cersei Lannister sits on a gilded chair at the foot of the throne.

If a king dies and his own queen acts as regent for their children, she is known as the "Queen Regent". Since a regency, by definition, requires a king's death, the title "King Regent" is never used; a male acting as regent for a king would hold the title "Lord Regent". Regents for regular lordships may be called "Lord (Lady) Protector" or "Lord (Lady) Regent".

Various regents

See also