Go-Shirakawa was initially an ally of Kiyomori - the latter began trade with China and supported Go-Shirakawa, not just militarily but also financially. The tension between the aforementioned foremost military clans, the Taira and Minamoto, led to the Heiji Rebellion of 1160. The Minamoto lost and the Taira attained ascendancy. As Kiyomori's power reached its zenith, the good relations between him and Go-Shirakawa ended - Kiyomori's reign became hubristic and indeed despotic, with the Taira showing unequivocal disrespect not only towards the imperial clan, but towards the other high-ranking families as well. For example, in 1170 Taira men humiliated the reigning Fujiwara Regent, Fujiwara no Motofusa, after his retinue and that of Kiyomori's son, Shigemori, collided.