Kutluk Säbäg Hatun

Qutluğ Säbig Qatun (title - ; personal name - , also known as Po Beg ) was the khatun (queen) and then hansha (queen mother) of the Second Turkic Khaganate. She served as regent during the minority of Tengri Qaghan, from 734 to 741.

Khatun Qutluğ Säbäg Qatun's father was Tonyukuk, an apa tarkan, a title equivalent to prime minister. She married Bilge Qaghan before 717, while he was still a tegin (prince).

In 734, Bilge was killed by poison. Säbäg's sons succeeded him. After the death of her first son Yollıg Khagan in 739, her other son Tengri Qaghan (?–741) was enthroned.

Regent Tengri was young and Säbäg acted as a queen regent. However, the real power was in the hands of two shads (local governors), one in the west and the other in the east. Säbäg tried to centralize power and planned to execute the two governors. She had the governor in the west executed but Pan Kül Tigin, the governor in the east, became suspicious and revolted, killing Tengri Qaghan 742. Two years later, the empire was dissolved following a joint rebellion of Uyghurs, Karluks and Basmyls.

During the last days of the khaganate, Säbäg, together with her clan, took refuge in Tang China. Emperor Xuanzong of Tang greeted her and threw a banquet for her. She was given the title of princess, and was appointed the ruler of her people. According to the New Book of Tang, Xuanzong sent flour to her clan during the harvest season. According to Russian historian Lev Gumilev, she saved her people but not her nation.