After the death of Fuhito who was involved with the compilation of Ritsuryo codes, the relocation of Heijo-kyo capital and so on, four brothers fought for the political power with Prince Nagaya through the reigns of Empress Gensho to Emperor Shomu.
律令編纂や平城京遷都などに関わった不比等亡き後、四兄弟は元正天皇・聖武天皇の時代に渡り長屋王と政権の座を争った。