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.
Abdulaziz bin Abdul Rahman bin Faisal bin Turki bin Abdullah bin Mohammed bin Saud, known in the Western world mononymously as Ibn Saud, was an Arab political and religious leader who founded Saudi Arabia – the third Saudi state – and reigned as its first king from 23 September 1932 until his death in 1953. He had ruled parts of the kingdom since 1902, having previously been Emir, Sultan, and King of Nejd, and King of Hejaz.
Saud bin Abdulaziz Al Saud ruled the First Saudi State from 1803 to 1814. Saud annexed Mecca and Medina from the Ottoman Empire making him the first Al Saud ruler who received the title of the servant of the Two Holy Cities. During his rule the state experienced a significant level of strength and expansion for which he was called Saud Al Kabeer or Saud the Great.
The Wahhabi war, also known as the Ottoman-Saudi War, (1811–1818) was fought from early 1811 to 1818, between the Ottoman Empire, their vassal and ally the Eyalet of Egypt, and the Emirate of Diriyah, the first Saudi state, resulting in the destruction of the latter.
Al Ahsa also known as Hajar is the largest governorate in Saudi Arabia's Eastern Province, named after the Al-Ahsa Oasis. In Classical Arabic, 'Ahsa' means the sound of water underground. It has one of the largest oases in the world with world-renowned date palms and, according to one author, the oases of Al-Hasa and Al Ain are the most important in the Arabian Peninsula. The oasis is located about 60 mi (97 km) inland from the Arabian Gulf. All urban areas are located in the traditional oasis of Al-Hasa. In addition to the oasis, the county also includes the giant Empty Quarter desert, making it the largest governorate in Saudi Arabia in terms of area. The Empty Quarter has the world's largest oil fields, and connects Saudi Arabia to Qatar, the UAE, and Oman. The Governorate's population is over 1,100,000. In the past, Al-Ahsa belonged to the historical region known as Bahrain, along with Qatif and the present-day Bahrain islands.
The Ikhwan, commonly known as Ikhwan man ata'a Allah, was a Wahhabi religious militia made up of traditionally nomadic tribesmen which formed a significant military force of the ruler Ibn Saud and played an important role in establishing him as ruler of most of the Arabian Peninsula in the unified Kingdom of Saudi Arabia.
Faisal bin Turki Al Saud was the second ruler of the Second Saudi State and seventh head of the House of Saud.
The Emirate of Nejd or Imamate of Nejd was the Second Saudi State, existing between 1824 and 1891 in Nejd, the regions of Riyadh and Ha'il of what is now Saudi Arabia. Saudi rule was restored to central and eastern Arabia after the Emirate of Diriyah, the First Saudi State, having previously been brought down by the Ottoman Empire's Egypt Eyalet in the Ottoman–Wahhabi War (1811–1818).
Uqair, alternatively spelled as al-'Uqair, Uqayr, and Ogair, is an ancient seaport city in the Al-Ahsa Governorate of the Eastern Province of Saudi Arabia. It is the first seaport in the Persian Gulf and has been linked by some to the ancient city of Gerrha mentioned in Greek and Roman sources. The site was also the location of the conference at which the Uqair Protocol of 1922 was issued, which helped to establish the borders of modern Saudi Arabia.
Al-Ahsa Oasis, also known as al-Ḥasāʾ (الْحَسَاء) or Hajar (هَجَر), is an oasis and historical region in eastern Saudi Arabia. Al-Ahsa Governorate, which makes up much of the country's Eastern Province, is named after it. The oasis is located about 60 km (37 mi) inland from the coast of the Persian Gulf. Al-Ahsa Oasis comprises four main cities and 22 villages. The cities include Al-Mubarraz and Al-Hofuf, two of the largest cities in Saudi Arabia.
Bani Khalid is an Arab tribal confederation mainly inhabiting the Arabian Peninsula. The tribe ruled southern Iraq, Kuwait, and Eastern Arabia from the 15th century to the 18th century, and again under the auspices of the Ottoman Empire during the early 19th century. At its greatest extent, the domain of Bani Khalid extended from Iraq in the north to the borders of Oman in the South, and Bani Khalid wielded political influence by ruling the region of Najd in central Arabia. Most of the tribe's members presently reside in eastern and central Saudi Arabia, while others live in Iraq, Kuwait, Qatar, Bahrain, Syria, Palestine, Lebanon and the United Arab Emirates. Bani Khalid has both Shia Muslim and Sunni Muslim members.
The Unification of Saudi Arabia was a military and political campaign in which the various tribes, sheikhdoms, city-states, emirates, and kingdoms of most of the central Arabian Peninsula were conquered by the House of Saud, or Al Saud. Unification started in 1902 and continued until 1932, when the Kingdom of Saudi Arabia was proclaimed under the leadership of Abdulaziz, known in the West as Ibn Saud, creating what is sometimes referred to as the Third Saudi State, to differentiate it from the Emirate of Diriyah, the First Saudi State and the Emirate of Nejd, the Second Saudi State, also House of Saud states.
Saudi Arabian oil was first discovered by the Americans in commercial quantities at Dammam oil well No. 7 in 1938 in what is now modern day Dhahran.
The Kuwait–Najd War erupted in the aftermath of World War I. The war occurred because Ibn Saud of Najd wanted to annex Kuwait. The sharpened conflict between Kuwait and Najd led to the death of hundreds of Kuwaitis. The war resulted in sporadic border clashes throughout 1919–1920.
The First Saudi–Hashemite War, also known as the First Nejd–Hejaz War or the al-Khurma dispute, took place in 1918–19 between Abdulaziz Ibn Saud of the Emirate of Nejd and Hasa and the Hashemites of the Kingdom of Hejaz.
The Sheikhdom of Kuwait was a sheikhdom during the pre-oil era. The sheikhdom became a British protectorate between 1899 and 1961 following the Anglo-Kuwaiti agreement of 1899. This agreement was made between Sheikh Mubarak Al-Sabah and the British Government in India, primarily as a defensive measure against threats from the Ottoman Empire. After 1961, the sheikdom became the state of Kuwait.
The Ottoman era in the history of Arabia lasted from 1517 to 1918. The Ottoman degree of control over these lands varied over these four centuries, with the fluctuating strength or weakness of the Empire's central authority.
Bani Khalid Emirate or the Emirate of Al Humaid from the Bani Khalid tribe was a state that arose in the eastern region of the Arabian Peninsula in 1669 after Emir Barrak ibn Ghurayr made his capital in Al-Mubarraz, then managed to defeat the Ottoman Empire represented by Lahsa Eyalet and drove them out of the region. The Emirate of Al Humaid ended in 1796 after the defeat of Barak bin Abdul Mohsen at the hands of the First Saudi State.
Dhaydan bin Hithlain was one of the leaders of the Ajman tribe and Amir of the hijrah (settlement) of Al Sarrar. His full name was Dhaydan bin Khalid bin Hizam bin Hithlain. Alexei Vassiliev also calls him Zaidan.
The Declaration of theUnification of Saudi Arabia was officially announced by Prince Faisal bin Abdulaziz, the Viceroy of Hejaz on behalf of King Abdulaziz ibn Saud on September 23, 1932, at 9:00 am from al-Hamidiyah Palace in Mecca. Faisal read out the Royal Decree No. 2716 issued by Abdulaziz ibn Saud on September 18, 1932, that renamed the Kingdom of Hejaz and Nejd and its annexes as the Kingdom of Saudi Arabia.
Ottoman Empire Supported by:
British Empire 
Abdulaziz Ibn Saud 
Ikhwan militia [1] 
