What year did XXX start?
Forty Years' War
The Forty Years' War (Burmese: အနှစ်လေးဆယ်စစ်; 1385 -- 1424; also Ava-Pegu War or the Mon-Burmese War) was a military conflict fought between the Burmese-speaking Kingdom of Ava and the Mon-speaking Kingdom of Hanthawaddy Pegu.
1385