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Tametomo fought alongside his father in the Hôgen Rebellion of [[1156]], siding with [[Emperor Sutoku]] against [[Emperor Go-Shirakawa]] (who, incidentally, had Minamoto no Yoshitomo, Tametomo's brother, on his side). After Go-Shirakawa's victory, Yoshitomo was forced to behead his father, Tameyoshi, and several of his brothers and other close relatives who had opposed Emperor Go-Shirakawa. Tametomo, renowned for his skill with a bow, had the ligaments or tendons of his bow arm cut, rendering it useless, before he was exiled to Izu Ôshima.

Tametomo fought alongside his father in the Hôgen Rebellion of [[1156]], siding with [[Emperor Sutoku]] against [[Emperor Go-Shirakawa]] (who, incidentally, had Minamoto no Yoshitomo, Tametomo's brother, on his side). After Go-Shirakawa's victory, Yoshitomo was forced to behead his father, Tameyoshi, and several of his brothers and other close relatives who had opposed Emperor Go-Shirakawa. Tametomo, renowned for his skill with a bow, had the ligaments or tendons of his bow arm cut, rendering it useless, before he was exiled to Izu Ôshima.

From this point onwards, history and myth are difficult to tell apart. According to the tales in which he traveled to Ryûkyû, he regained use of his arm before long. On Ôshima, he is said to have taken a young woman named Sasarae, the daughter of the island magistrate Tadashige, as his wife, giving her two sons, Tamemaru and Tomokawa, and a daughter named Shimagimi. He is said to have taken over the island, and several others nearby, before leaving for Ryûkyû, where he is said to have married the chieftain's daughter Nei, and sired the son Shunten.

Some accounts have him simply committing suicide on Izu Ôshima, never seeing the mainland again.<ref>Yokoyama Manabu 横山学, ''Ryûkyû koku shisetsu torai no kenkyû'' 琉球国使節渡来の研究, Tokyo: Yoshikawa kôbunkan (1987), 5.</ref> However, according to the tales in which he traveled to Ryûkyû, he regained use of his arm before long. On Ôshima, he is said to have taken a young woman named Sasarae, the daughter of the island magistrate Tadashige, as his wife, giving her two sons, Tamemaru and Tomokawa, and a daughter named Shimagimi. He is said to have taken over the island, and several others nearby, before leaving for Ryûkyû, where he is said to have married the chieftain's daughter Nei, and sired the son Shunten.

The legend of his involvement in [[Ryukyu Islands|Ryûkyû]] is related in numerous [[Edo period]] texts; the precise origin of the myth is unclear, but it appears as early as [[1650]], in the ''[[Chuzan Seikan|Chûzan Seikan]]'' compiled by Ryukyuan royal advisor [[Sho Shoken|Shô Shôken]]. The story is repeated, or elaborated upon, in [[Arai Hakuseki]]'s [[1719]] book ''[[Nantoshi|Nantôshi]]'', [[Morishima Churyo|Morishima Chûryô's]] [[1790]] publication ''[[Ryukyu-banashi|Ryûkyû-banashi]]'', and [[Takizawa Bakin]]'s novel ''[[Chinsetsu yumihari tsuki]]'', which expands the story out to a full novel.

The legend of his involvement in [[Ryukyu Islands|Ryûkyû]] is related in numerous [[Edo period]] texts; the precise origin of the myth is unclear, but it appears as early as [[1650]], in the ''[[Chuzan Seikan|Chûzan Seikan]]'' compiled by Ryukyuan royal advisor [[Sho Shoken|Shô Shôken]]. The story is repeated, or elaborated upon, in [[Arai Hakuseki]]'s [[1719]] book ''[[Nantoshi|Nantôshi]]'', [[Morishima Churyo|Morishima Chûryô's]] [[1790]] publication ''[[Ryukyu-banashi|Ryûkyû-banashi]]'', and [[Takizawa Bakin]]'s novel ''[[Chinsetsu yumihari tsuki]]'', which expands the story out to a full novel.