an important official in some Muslim countries in the past, especially one who advises and helps a powerful ruler

Shmu'el Hanagid was an 11th-century poet, general and vizier to the Muslim ruler of Granada. 什穆埃尔·哈纳吉德是11世纪的诗人、将军和格拉纳达穆斯林统治者的重臣。

Kemal served in the government of Ahmed Tevfik Pasha, Grand Vizier of the Ottoman Empire. 凯末尔曾在奥斯曼帝国大维齐尔艾哈迈德·泰夫菲克帕夏的政府中任职。

the most important adviser and helper of a powerful person

At that time Campbell was grand vizier to the Prime Minister. 当时坎贝尔任首相顾问。