Le Than Bwa was sawbwa (ruler) of Onbaung from the 1420s to 1459/60. Initially a vassal of Ava, the sawbwa kept his small Shan-speaking state independent from 1426 to 1444. He is known in Burmese history for his 1425 assassination of King Thihathu of Ava.

Thihathu of Ava was king of Ava from 1421 to 1425. Though he opportunistically renewed the Forty Years' War with Hanthawaddy Pegu in 1422, Thihathu agreed to a peace treaty with Prince Binnya Ran in 1423. His subsequent marriage to Ran's sister Princess Shin Saw Pu helped keep the peace between the two kingdoms when Ran became king of Pegu in 1424.