Yết Kiêu (real name Phạm Hữu Thế, 1242–1303) was a renowned general of the Trần Dynasty, celebrated for his extraordinary swimming and diving abilities—akin to those of a "water deity." He was appointed "Supreme Commander of the Trần Dynasty Navy" and achieved great distinction by scuttling numerous Mongol invasion warships during the resistance wars. Background and legends regarding his aquatic prowess: Origins: He was born into a poor fishing family in Hạ Bì Village, Gia Lộc District, Hải Dương Province. Underwater talents: Folklore holds that he could remain submerged for six to seven days, drink water as easily as on land, and swim with the speed of a giant fish. Legend also has it that he was taught secret techniques by the "Mistress of Swimming." Name: Recognizing his exceptional talent, the Trần Dynasty rulers bestowed upon him the name "Yết Kiêu"—the name of a massive deep-sea fish. Military exploits during the Trần Dynasty: He was one of the trusted, talented generals serving under Grand Commander Hưng Đạo (Trần Quốc Tuấn). During naval battles against the Mongol invaders, he and his comrade Dã Dượng would dive deep underwater at night to bore holes in the enemy's massive warships, throwing the opposing forces into panic.