A report on House of Saud

He united the four regions into a single state through a series of conquests beginning in 1902 with the capture of Riyadh, the ancestral home of his family, the Al Saud.

Najd (نَجْدٌ, ), or the Nejd, forms the geographic center of Saudi Arabia, accounting for about a third of the country's modern population and, since the Emirate of Diriyah, acting as the base for all unification campaigns by the House of Saud to bring Arabia under a single polity and under the Salafi jurisprudence.

With the collapse of the Ottoman Empire after World War I, the Al-Saud dynasty, and with it Wahhabism, spread to the holy cities of Mecca and Medina.

The Al Saud family had been a power in central Arabia for the previous 130 years.

The House of Saud and its allies quickly rose to become the dominant power in Arabia by first conquering Najd, and then expanding their influence over the eastern coast from Kuwait down to the northern borders of Oman.

The appointment of a successor by the King was usually done with some form of informal consensus among members of the royal family.

This agreement became a "mutual support pact" and power-sharing arrangement between the Aal Saud family, and the Aal ash-Sheikh and followers of Ibn ʿAbd al-Wahhab, which had remained in place for nearly 300 years, providing the ideological impetus to Saudi expansion.

Its members were rulers of the Emirate of Ha'il and the most formidable enemies of the House of Saud, rulers of the Emirate of Nejd.

Muhammad bin Saud Al Muqrin (محمد بن سعود آل مقرن Muḥammad bin Suʿūd Āl Muqrin; 1687–1765), also known as Ibn Saud, was the emir of Diriyah and is considered the founder of the First Saudi State and the Saud dynasty, which are named for his father, Saud bin Muhammad Al Muqrin.

Severe internal conflicts within the House of Saud eventually led to the dynasty's downfall at the Battle of Mulayda in 1891, between the forces loyal to the last Saudi imam, Abdul Rahman ibn Faisal ibn Turki, and the Rashidi dynasty of Ha'il.