Narahthu ascended the throne after murdering his father King Alaungsithu and his elder brother Min Shin Saw.
[6] Narathu was a senior prince for much of his father's reign, whereas the king's eldest son Min Shin Saw was the heir apparent.
However, Min Shin Saw had a major falling out with his father, and was sent to exile at Aung Pinle Lake (near present-day Mandalay).
[5] In 1167, Alaungsithu fell violently ill, and Narathu ordered the king moved to the Shwegugyi Temple, which Sithu had built in 1131.
The queen was a daughter of the chief of Pateikkaya, a tributary kingdom in the west in Bengal (near present-day Chin State).
[9] The chief of Pateikkaya, angered by Narathu's action, sent a group of eight assassins, disguised as Brahmin astrologers in 1171.
[11] Wilhelm Geiger also refuted this in his trustworthiness of Mahavamsa saying"It is hardly doubtful that the report in the Culavamsa of the Ramanna campaign is much exaggerated, as the Burmese chronicles have nothing to say about such a catastrophe having overtaken their country".