Emirate of Diriyah in the context of "Saudi royal family"

The history of Saudi Arabia as a nation state began with the emergence of the Al Saud dynasty in central Arabia in 1727 and the subsequent establishment of the Emirate of Diriyah. Pre-Islamic Arabia, the territory that constitutes modern Saudi Arabia, was the site of several ancient cultures and civilizations; the prehistory of Saudi Arabia shows some of the earliest traces of human activity in the world.

The world's second-largest religion, Islam, emerged in what is now Saudi Arabia. In the early 7th century, the Islamic prophet Muhammad united the population of Arabia and created a single Islamic religious polity. Following his death in 632, his followers rapidly expanded the territory under Muslim rule beyond Arabia, conquering huge and unprecedented swathes of territory (from the Iberian Peninsula in the west to modern-day Pakistan in the east) in a matter of decades. Arab dynasties originating from modern-day Saudi Arabia founded the Rashidun (632–661), Umayyad (661–750), Abbasid (750–1517), and Fatimid (909–1171) caliphates, as well as numerous other dynasties in Asia, Africa, and Europe.

The House of Saud (Arabic: آل سُعُود, romanized: ʾĀl Suʿūd IPA: [ʔaːl sʊʕuːd]) is the ruling royal family of Saudi Arabia. It is composed of the descendants of Muhammad bin Saud, founder of the Emirate of Diriyah, known as the First Saudi State, (1727–1818), and his brothers, though the ruling faction of the family is primarily led by the descendants of Ibn Saud, the modern founder of Saudi Arabia. It forms a subtribe of the larger prominent ancient Banu Hanifa tribe of Arabia, from which well known 7th century Arabian theologist Maslama ibn Ḥabīb originates. The most influential position of the royal family is the King of Saudi Arabia, an absolute monarch. The family in total is estimated to comprise 15,000 members; however, the majority of power, influence and wealth is possessed by a group of about 2,000 of them. Some estimates of the royal family's wealth measure their net worth at $1.4 trillion. This figure includes the market capitalization of Saudi Aramco, the state oil and gas company, and its vast assets in fossil fuel reserves, making them the wealthiest family in the world and the wealthiest in recorded history.

The House of Saud has had four phases: the Sheikhdom of Diriyah (1446–1744); the Emirate of Diriyah (1727–1818), marked by the expansion of Salafism; the Emirate of Nejd (1824–1891), marked with continuous infighting; and the current state (1902–present), which evolved into the Kingdom of Saudi Arabia in 1932 and now wields considerable influence in the Middle East. The family has had conflicts with the Ottoman Empire, the Sharif of Mecca, the Al Rashid family of Ha'il and their vassal houses in Najd along with numerous Islamist groups both inside and outside Saudi Arabia and Shia minority in Saudi Arabia.

The walled town of Riyadh was the original core of Riyadh, the modern-day capital of Saudi Arabia, located on the western edge of Wadi al-Batʼha in present-day districts of ad-Dirah and ad-Doho. It emerged from the city-state of Migrin around 1746 when Dahham ibn Dawwas built a wall and a Al Hukm Palace within it, and ruled as the settlement's chieftain until his overthrow by the First Saudi State in 1773. It was later the center of power of the Second Saudi State for most of 19th century following brief Ottoman presence in the Najd. Abdulaziz ibn Saud recaptured the town in 1902 and made it the base for his 30-year long unification wars that led to the establishment of Saudi Arabia in 1932. The town served as the administrative center of the Saudi government before King Abdulaziz ibn Saud moved his workplace and residence to the Murabba Palace in 1944. In 1950, he instructed the dismantling of the fortifications in order to expand the settlement into a metropolis and the walled town eventually ceased to exist. The area covering the perimeters of the erstwhile town was renamed as the Qasr al-Hukm District in 1973 with the aim of preserving its historical and architectural significance.

The Al Qasimi (Arabic: القاسمي, spelled sometimes as Al Qassimi or Al Qassemi; plural: Al Qawasem Arabic: القواسم and, archaically, Joasmee) is an Arab dynasty and tribe that rules Sharjah and Ras Al Khaimah, today forming two of the seven emirates of the United Arab Emirates. They are one of the longest reigning royal families in the Arabian peninsula. Historically, they also ruled over the town of Lengeh as sheikhs for a century until its annexation by Iran in 1887.

The Qawasem were a confederation of Sunni tribes in south eastern Gulf region surrounding the cities of Ras Al Khaimah and Sharjah; and faced strong rivalry with the Omani empire for naval domination along the Persian Gulf. Due to their allegiance to the Emirate of Dir'iyah, the British Empire branded them as "pirates" and fought two major military campaigns against them in 1809 and 1819.

The Diriyah pact was an agreement signed between the Emir of Diriyah, Imam Muhammad bin Saud, and Imam Muhammad bin Abdul-Wahhab in the year 1744. The two imams agreed to call for correcting the people's faith from the polytheism, heresies, and superstitions attached to it, by returning to what Muhammad was upon, and carrying out the duty of enjoining what is right and forbidding what is wrong. After the pact, the reform movement began its work, and the Salafist call spread and became widely influential with supporters throughout the Arabian Peninsula and outside it. The pact is considered the basis on which the modern Saudi state was established.

Al-Baqi Cemetery, the oldest and one of the two most important Islamic graveyards located in Medina, in current-day Saudi Arabia, was demolished in 1806 and, following reconstruction in the mid-19th century, was destroyed again in 1925 or 1926. An alliance of the House of Saud and the followers of the Wahhabi movement known as the Emirate of Diriyah carried out the first demolition. The Sultanate of Nejd, also ruled by the House of Saud and followers of Wahhabism, carried out the second demolition. In both cases, the actors were motivated by the Wahhabi interpretation of Islam, which prohibits the building of monuments on graves.