When Saw Mon ascended to the throne in April 1404 after his uncle's assassination by a monk, the Arakanese (Rakhine) kingdom had been on its last legs for three decades. The kingdom had experienced seemingly endless episodes of political instability and interference from its two stronger neighbors to the east
Ava Kingdom (Ava) and
Hanthawaddy kingdom (Pegu). In 1373/74 (735 ME), the Launggyet court had to ask for a nominee from Ava, which sent
Saw Mon II. Saw Mon II was a good ruler but died in 1381 without an heir. Ava sent another nominee. The new king proved to be a tyrant, and was driven out by the court in 1385/86. From 1385/86 to 1404, the Arakanese throne was subject to rival factions of the court, often supported by Ava and Pegu. However these events are not recorded in the Arakanese Chronicles, neither does it mention court political influence from
Ava and
Pegu. King Min Hti died in 1385, his three sons whom reigned for short period until Razathu proclaimed the throne in 1395 and 1397 until his death in 1401. According to the Arakanese Chronicles, Saw Mon's desired over the sister of Viceroy of Dalet, Saw Pu Nyo. King lifted for Dalet and forced Saw Pu Nyo to divorce her husband and later killed husband. This enraged her brother, who later seeks help from the King of Ava to invade and dethroned the ruler. Saw Mon could not escape the commotion either as his abuse power eventually backfire within two years of Saw Mon's accession, the kingdom was drawn into the
Forty Years' War between Ava and Pegu. In November 1406, King
Minkhaung I of Ava sent in troops led by its crown prince
Minye Kyawswa. Ava troops overran Launggyet on 29 November 1406 (Monday, 5th waning of Natdaw 768 ME). Minkhaung I appointed
Anawrahta Saw, then governor of
Kalay, to be "king" of Arakan. Saw Mon barely escaped to Chittagong with a few of his retinue. ==Exile years and restoration==