Caliph Al-Hasan ibn ‘Ali is the grandson of which Islamic prophet?
Mujtaba Al-Mujtaba (Arabic: اَلْـمُـجْـتَـبَى‎ ‎ ) is an Arabic word which means "The Selected One" or "The Chosen One among many." It is a title of the Islamic "Nabi" (Arabic: نَـبِي‎ ‎ , Prophet) Muhammad, and his grandson, the Caliph Al-Hasan ibn ‘Ali.
Banu Ukhaidhir The Banu 'l-Ukhaidhir (Arabic: بنو الأخيضر‎ ‎ ) was a dynasty that ruled in Najd and al-Yamamah (central Arabia) from 867 to at least the mid-eleventh century. An Alid dynasty, they were descendents of Muhammad through his daughter Fatimah and his grandson Al-Hasan, and at least one contemporary traveler describes them as having been Shi'ites of the Zaydi persuasion. Their capital was known as al-Khidhrimah, which lay near the present-day city of Al-Kharj in Saudi Arabia.