General islamic histroy

1. The land that was first to accept wilayat e mola Ali (a.s) 2. How old was janab e Ali Asghar (a.s) when Imam Hussain (a.s) left madina 3. The first namaz offered by Rasool allah (saw) after the very first wahi from Allaha . 4. Who dig the grave of Imam Ali (a.s) 5. Two of the following known as Baab-ul-Hawaiej