| KING BOROMMARACHA I (สมเด็จพระบรมราชาธิราช ๑) |

| Text by Tricky Vandenberg - September 2011 |
1371 - Start of the attacks on Sukhothai. 1378 - Sukhothai becomes a vassal state. 1386 - Attack of Lan Na (Lampang). 1388 - Loss of the Phra Sihing to Lan Na. |
| Important events during the reign |