In 1279 AD, in the Naval Battle of Yamen (崖門戰役) at the Pearl River Delta (珠江), the final conflict between the Mongol Forces (元) and the Southern Sung Empire (南宋國) was fought. The Mongol forces managed to advance to the center of the Southern Sung fleet and attack the boat of the child emperor Songdi Bing (宋帝昺). Seeing no hope of breaking free, the Minister of the Left (重臣) Liu Xiufu (陸秀夫) 
decided to commit suicide with the boy emperor rather than be captured by the Mongols. He jumped into the sea with the boy emperor and many officials and concubines followed suit. A few days later, the tattered remains of the boy emperor was found floating in Shekou Bay(蛇口). This sealed the fate of the Southern Song Empire.
Oral History:
Before the final sea battle at Yamen (崖門戰役), Minister of the Left Liu Xiufu (陸秀夫) disguised his own son to look like the boy emperor Songdi Bing (宋帝昺). When the Mongols finally managed to attack the center of the Southern Sung fleet, Liu Xiufu committed suicide with his own son disguised as the emperor. The finest and most loyal of the Southern Sung fleet under the command of Grand General Zhang Shijie (張世傑). managed to break off from the battle with the real emperor and escape across the sea. There they established the Lesser Song Empire (呂宋國) at its capital Tondo (東都).
Facts:
1. Even though the corpse of the last emperor of the Southern Song Empire was reportedly found, no graveyard was ever erected.
2. Chinese historians agree that the Southern Sung Fleet under the command of Grand General Zhang Shijie (張世傑) did survive the final Battle of Yamen (崖門戰役) and that they simply vanished from record. 
3. Tondo (東都) was the capital of an empire recorded by the Ming Dynasty (大明國) as the Luzon Empire (呂宋國).4. Luzon Empire (呂宋國) was conquered by the Spaniards in 1571 and the province of Pampanga was the first colonial province carved out of it. The whole northern island was named Luzon. Tondo (東都) still exist today as a mere suburb of Manila.
