Authority
noun
You have rights and might over this area. That gives you authority.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
権威を失ったのにまだ過去の栄光にしがみついていて、全く往生際が悪いったらありゃしないよ。
He's awfully persistent as he still clings to his faded glory even though he lost his authority.