Saw Zein
Saw Zein was king of Martaban from 1323 to 1330. He inherited a newly independent kingdom from his elder brother Saw O but spent much of his reign putting down rebellions. Although he regained the Mon-speaking provinces of Lower Burma, he could not recover the Tenasserim coast from Martaban's former overlord Sukhothai.
Zein was assassinated in 1330 in a coup organized by Zein Pun, one of his senior commanders. Zein Pun seized the throne only to be killed a week later.
Early life
provide little information about his early life. Saw Zein was born on 19 May 1303 to Princess Hnin U Yaing and Gov. Min Bala of Myaungmya. He had two other full brothers, and at least one half brother. He was presumably brought up in Myaungmya, a key port in the Irrawaddy delta, where his father was governor. His whereabouts during the reign of his eldest brother King Saw O is unknown except that Zein was married to his first cousin Princess Sanda Min Hla, and had three children by 1323.Reign
Accession
The prince was suddenly thrust into the spotlight in September 1323 when the 39-year-old O died. With O's eldest son, Saw E, still just about 10 years old, the 19-year-old Zein ascended the Martaban throne. At his accession, he made Sanda Min Hla his chief queen but also raised his sister-in-law May Hnin Htapi, who was a Siamese princess, as a principal queen.Reunification campaigns
At his accession, Zein inherited a fully independent kingdom. O had broken with his nominal overlord Sukhothai since 1319, and taken Lamphun and the Tenasserim coast by 1321. However, in the tradition of the prevailing Southeast Asian administrative model, every new high king had to establish his authority with the vassals all over again. The 19-year-old king garnered no initial support, and the vassal rulers in the Pegu province and delta promptly revolted.Zein had to rebuild the kingdom all anew. His first target was the Pegu province. He left the capital Martaban with a strong garrison, and marched north with the army. The inaugural campaign was successful; he took Pegu, Dagon, Dala and Watanaw.
His next target was the Irrawaddy delta province, which remained in revolt. He did not return to Martaban, and instead affixed a temporary capital north of Pegu. He went on elephant hunting trips to gather more war elephants for the next campaign. With the renewed force, Zein then invaded the delta, and got the lords of Myaungmya and Bassein to submit.
His job was far from over. While Zein was campaigning in Lower Burma, his nominal vassals on the Tenasserim coast also revolted. Zein sent a force led by Gen. Bon-Yin to retake the coast. The army regained Tavoy but was driven back at Tenasserim. He sued for a truce with Sukhothai. The king of Sukhothai treated him like a vassal, giving him the title Binnya Ran De.
Later campaigns
After the truce with Sukhothai, Zein tried to pick off Prome, then a nominal vassal of the northern Pinya Kingdom. He sent a sizable force led by his half-nephew Saw E Pyathat but the invaders were driven back. Pyathat died in action. The defeat in the north augured renewed hostilities in the south. The truce with Sukhothai had ended by the late 1320s when Martaban again lost control of Tavoy. Zein sent his nephew Saw E to retake Tavoy but the campaign ended badly. Zein blamed the failure on E, and sent his nephew to prison near the frontier with Prome.Death
Zein was assassinated in a coup by one of his trusted officers Zein Pun April/May 1330. The chronicle says that Pun, the commander of a special 500-man battalion, invited the king to a housewarming ceremony of Pun's new residence, and had his men assassinate the unsuspecting king as he entered the house. Zein Pun seized the throne. But the usurper was killed a week later in a putsch organized by Zein's chief queen Sanda Min Hla.Family
According to the Razadarit Ayedawbon chronicle, the king had two principal queens and five children by them. He had at least another daughter, Tala Saw Lun by a concubine.| Queen | Rank | Issue | Reference |
| Sanda Min Hla | Chief queen | Mwei Ne Maha Dewi, Regent of Hanthawaddy Binnya U, King of Hanthwaddy | |
| May Hnin Htapi | Principal queen | Mi Ma-Hsan, wife of Byattaba of Martaban Min Linka, Gov. of Pegu |