権勢

彼は長年にわたり政界で権勢を振るってきた。

He has wielded power in political circles for many years.

平氏の権勢も長くは続かなかった。

Even the power of the Taira clan did not last long.

権勢を誇った一族も、やがて没落した。

The family that had boasted such power eventually fell into decline.