National Day in Saudi Arabia is observed every September 23, commemorating the proclamation of the Kingdom of Saudi Arabia in 1932. This public holiday marks the unification of the Third Saudi State, which began with Abdulaziz bin Abdul Rahman Al Saud, known as Ibn Saud, who captured Riyadh in 1902 and later conquered the Heijaz region, home to the Islamic holy cities of Mecca and Medina. The celebration highlights the historical significance of the House of Saud, which was founded in 1744, and acknowledges the earlier Saudi states that existed until their defeats in the 19th century. On this day, various festivities take place across the country, including cultural events and public gatherings, reflecting national pride and unity.