
In the era before shinobi, Tenji ruled the Land of Ancestors as its emperor. A leader who prized peace above all, he lost his heart to the exiled princess Kaguya Ōtsutsuki, then turned against her once her power threatened to spark war, and in doing so fathered Hagoromo and Hamura.
Living in the age before shinobi arose, Tenji held the throne of the Land of Ancestors while it feuded with the Land of That across a contested border. Where both his subjects and the rival nation favoured force, he pressed for talks and treaties, hoping to keep war from igniting. Kaguya's arrival changed everything: startled to hear she had come 'from the stars', he warmed to her the instant she voiced a wish for peace that matched his own. He let her remain on his land, called on her daily, and fell in love, even as word of the affair drifted to the Land of That.
So fierce was his commitment that he warned his own followers he would have them killed if they jeopardised the calm. When Suzaku, that nation's minister, attempted to seize Kaguya and she cut down his soldiers defending herself, Tenji shrank in dread from her divine might and resolved to betray her rather than let war erupt. As both camps closed in to capture her, Kaguya devoured the God Tree's fruit and, newly empowered, cast the Infinite Tsukuyomi. Caught in the genjutsu, Tenji asked what she was, never realising she was carrying his two sons.
Good-hearted and honourable, Tenji held his realm and its people close and would go to almost any length to dodge bloodshed, even sitting down to bargain with foes. He carried little spite for his rivals; for example, the Land of That once leaned on a forged map to pry territory from his country. He loved Kaguya dearly and guarded her, the two of them united by a dream of a peaceful world; yet that love for peace finally outweighed his love for her, since he stood ready to hand her over to death to hold war back.

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Tenji was the emperor of the Land of Ancestors in the era before shinobi existed. A peace-seeking ruler, he fell in love with the exiled princess Kaguya Otsutsuki and later fathered her sons, Hagoromo and Hamura.
The two are shown sharing a mutual dream of peace and a romantic relationship, and Kaguya bore his sons Hagoromo and Hamura. Tenji's own love for her is made clear, though it is ultimately he who turns on her out of fear once her overwhelming power is revealed.
No, Tenji never realized Kaguya was carrying his two sons. He was still asking what she truly was when he was caught in the Infinite Tsukuyomi genjutsu she cast.
Tenji grew afraid of Kaguya's godlike power after she cut down soldiers who tried to seize her, and he resolved to betray her rather than let a war erupt between the Land of Ancestors and the Land of That.
Tenji ultimately decided to let enemies capture Kaguya to prevent a war, but as both camps closed in, she devoured the God Tree's fruit, gained immense power, and cast the Infinite Tsukuyomi, catching Tenji in the genjutsu.
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