Founding Day of SaudiArabia - 1744.
King Abdulaziz mentioned it in his historical account of the storming of Al-Masmak: “We walked with seven men, me, Abdul Aziz bin Jalawi, Fahd, Abdullah bin Jalawi, Nasser bin Saud, and with us Al-Ma’shouq and seventy.”
Reference
An old picture of a soldier pointing to the place (Al-Shalfa)"spear", which was thrown by bin Jalawi and settled in Al-Masmak gate on the day of the conquest of Riyadh in jun-1902.