Thettawshay of Sikyay (, ) was a grandson of King Kyawswa I of Pinya (r. 1344–1350). He is recognized as a patrilineal ancestor of the early Toungoo dynasty kings, including, Mingyi Nyo, Tabinshwehti and Nanda.
Brief All three main chronicles—the Maha Yazawin, Yazawin Thit, and Hmannan Yazawin—identify one Thettawshay as a patrilineal ancestor of King Mingyi Nyo (r. 1510–1530), the founder of the Toungoo Dynasty. The chronicles, however, do not agree on specific genealogical details.
Regarding his ancestry, the Maha Yazawin says Thettawshay was a son of Governor Shwe Nan Shin of Myinsaing. The Yazawin Thit states he was a son-in-law of Shwe Nan Shin, and his father was Min Letwe of Sikyay, a son of King Kyawswa I of Pinya and Queen Mway Medaw of Pinya. The Hmannan agrees with the Yazawin Thit's account.
Regarding his descendants, the Maha Yazawin says Mingyi Nyo was his three times great grandson, through his son Thray Waduna of Pinya. The Yazawin Thit states Mingyi Nyo was his two times great grandson, through his son titled Maha Thinkhaya I. The Hmannan generally accepts the Yazawin Thit's lineage but disagrees with the Yazawin Thit on the identity of the mother of Maha Thinkhaya I. The Hmannan names her as Saw Min Hla, daughter of Min Letya, not the daughter of Shwe Nan Shin, as stated in the Yazawin Thit.
Historian Sein Lwin Lay's 1968 analysis on the ancestry of King Mingyi Nyo essentially follows the Maha Yazawin's account. One key difference is that he changed Thettawshay's father to King Kyawswa I of Pinya. He did not provide an explanation as to how he arrived at this specific list, however.
The following table lists the chronicle accounts and Sein Lwin Lay's account regarding Mingyi Nyo's ancestry.
GenerationMaha Yazawin (1724)Maha Yazawin Vol. 2 2006: 130Yazawin Thit (1798)Yazawin Thit Vol. 1 2012: 343Hmannan Yazawin (1832)Hmannan Vol. 2 2003: 173(Sein Lwin Lay 1968)Sein Lwin Lay 2006: 47 Grandparents not mentioned not mentioned Parents Shwe Nan Shin of Myinsaing Min Letwe of Sikyay Min Letwe of Sikyay Kyawswa I of Pinya Self + wife Thettawshay Thettawshay Son + wife Thray Waduna of Pinya Thray Waduna of Pinya Grandson Thray Sithu Maha Thinkhaya II Maha Thinkhaya II Thray Sithu Great grandson Thray Thinkhaya Maha Thinkhaya III Maha Thinkhaya III Thray Thinkhaya 2x great grandson Maha Thinkhaya Mingyi Nyo Mingyi Nyo Maha Thinkhaya 3x great grandson Mingyi Nyo not mentioned not mentioned Mingyi Nyo
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