The "Mihrab" in a mosque was first institutionalized during the reign of the Umayyad Caliph:
Q1. The "Mihrab" in a mosque was first institutionalized during the reign of the Umayyad Caliph:
Answer: Al-Walid I
Explanation: The Mihrab (prayer niche) was first formally incorporated into mosque architecture under Umayyad Caliph Al-Walid I (r. 705–715 CE) during the renovation of the Prophet's Mosque in Madinah.