She was a daughter of King Hkun Law, and niece of the dynasty founder King Wareru. Her personal name was Hnin An Po. She had one full younger sister, Tala Shin Saw Bok, and at least one half brother, Binnya E Law. In 1311, she lost her father who was assassinated in a coup led by Gov. Min Bala of Myaungmya, husband of her aunt Hnin U Yaing. Bala and U Yaing spared the children of Hkun Law. Nonetheless they married her off to their son Saw Zein in the late 1310s. By 1323, she had three children with Zein: Mwei Ne, Mwei Na and Binnya U.
Palace power
In 1323, Zein ascended the throne, and she became the chief queen with the title of Sanda Min Hla. After Saw Zein was assassinated in 1330, she emerged as the kingmaker. One week later, the queen organized a successful counter coup against the usurper Zein Pun, and put him to death. She then placed Saw E, nephew of Saw Zein and grandson of king of Sukhothai, on the throne. Although E was her first cousin, once removed, she made herself his chief queen. But she was soon dissatisfied with the 16-year-old E. Her dissatisfaction may have something to do with the young king's decision to renew the allegiance to his grandfather Loe Thai of Sukhothai. E's father was the first to declare independence from Sukhothai in 1317/18, and Saw Zein had fought wars with the Siamese kingdom over the control of the Tenasserim coast. It did not help that the young king spent much of his time with concubines. The powerful queen poisoned the youngster, just 49 days later. She anointed her half-brother Binnya E Law to the throne, and again made herself the chief queen. Her murder of Saw E greatly angered the king of Sukhothai. Sukhothai forces invaded in 1330–1331 but were defeated. Martaban's subordination to Sukhothai ceased. She remained the chief queen until 1348. E Law was so concerned about the temper of his half sister that he left his concubines in Pegu. E Law also did not declare his own son Binnya E Laung as his heir-apparent; Sanda Min Hla's son Binnya U remained a serious contender to succeed E Law. When the rivalry between E Laung and U turned into a real fight, Sanda Min Hla shielded her son from the king's wrath. At any rate, her son became the heir presumptive as E Laung died soon after from smallpox. E Law also died soon after in 1348, and her son U ascended the throne. The queen dowager died in 1363/64 during her son's reign.
