Which grandson of the Prophet (PBUH) briefly served as Caliph before voluntarily relinquishing the position to Muawiyah (RA) for the sake of Muslim unity?

Explanation

– Hasan (RA), the elder son of Ali (RA) and Fatimah (RA), briefly served as Caliph following his father’s assassination, but voluntarily relinquished the position to Muawiyah (RA) to prevent further bloodshed and civil conflict among Muslims.
– This significant act of reconciliation, occurring in 41 AH, is often referred to as Aam-ul-Jamaah, the ‘Year of Unity,’ reflecting the restoration of a single unified Muslim leadership.
– For exams, note that this event is widely cited as an example of prioritizing the broader welfare and unity of the Muslim community over personal political position.