Who was the fifth righteous caliph of Hijaz?

Who was the fifth righteous caliph of Hijaz?

حجاز کا پانچواں صالح خلیفہ کون تھا؟
Explanation

Umar ibn Abd al-Aziz commonly known as Umar II .

Eighth Umayyad caliph.

First Mujaddid and sixth righteous caliph of Islam.

He reorganized and strengthened governmental administration and, throughout the empire, adopted Arabic as the language of administration.