Rajah Humabon, later baptized as Don Carlos, was the Rajah of Cebu at the time of Portuguese explorer Ferdinand Magellan's arrival in the Philippines in 1521. There is no official record of his existence before the Spanish contact in 1521, save for extensive narration by Italian historian Antonio Pigafetta on Humabon and the indigenous Philippine realms that existed prior to Spanish colonisation.

There is none official record on the origins of Rajah Humabon prior to the arrival of Magellan. According to tradition, Sri Hamabar (also known as Rajah Humabon) was the son of Sri Bantug, and the grandson of Sri Lumay.

Specifically, one of the native kings was Sri Lumay, a native from Sumatra, who settled in the Visayas and sired several sons, namely Alho, Ukob, Bantug. Sri Alho, who ruled a land known as Sialo which included the present-day towns of Carcar and Santander in the southern region of Cebu. Sri Ukob ruled a kingdom known as Nahalin in the north which included the present-day towns of Consolación, Liloan, Compostela, Danao, Carmen and Bantayan. He died in battle, fighting with the tribal group known as magalos from Mindanao.

The youngest of his sons was Sri Bantug who ruled a kingdom known as Singhapala (a variation of the Sanskrit Singha-Pura, "City of the Lion", which is the same root as "Singapore"), in a region which is now part of Cebu City, who died of disease and was succeeded by his son Sri Hamabar, also known as Rajah Humabon. Sri Bantug had a brother called Sri Parang the Limp, but could not rule because of his infirmity. Sri Parang handed his throne to his nephew Humabon as regent, and he became the Rajah (king) of Cebu.

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