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 Al Saud, known in the West 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.
Abdulaziz bin Muhammad Al Saud was the second ruler of the Emirate of Diriyah. He was the eldest son of Muhammad bin Saud and the son-in-law of Muhammad bin Abdul Wahhab. Abdulaziz ruled the Emirate from 1765 until 1803. He was nicknamed by his people as the savior of his time due to his fearless activities.
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 Ottoman/Egyptian-Wahhabi War also known as the Ottoman/Egyptian-Saudi War (1811–1818) was fought from early 1811 to 1818, between the Ottoman Empire 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. The name Al-Ahsa is also given to the biggest city in the governorate, Hofuf. 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 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 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.
Saud bin Faisal Al Saud, also known as Imam Saud, (1833—1875) was the ruler of the Second Saudi State in 1871 and 1873–75. He joined alliances with foreign tribes and revolted against his half-brother Abdullah. His rule was short-lived and Abdullah overthrew him. Saud gained power again in 1873 but died two years later. His reign was notable for the infighting in the House of Saud which he initiated.
Al-Aḥsāʾ, 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.
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.
Sultan bin Bajad bin Humaid al-'Utaybi was the Sheikh of the Otaibah tribe and one of the prominent leaders of the Ikhwan movement in the Arabian Peninsula. This tribal army supported King Abdulaziz in his efforts to unify Saudi Arabia between 1910 and 1927.
The Ikhwan revolt was an uprising in the Arabian Peninsula from 1927 to 1930 led by the Ikhwan. It began in 1927, when the tribesmen of the Otaibah, Mutayr and Ajman rebelled against the authority of Ibn Saud and engaged in cross-border raids into parts of Transjordan, Mandatory Iraq and the Sheikhdom of Kuwait. The relationship between the House of Saud and the Ikhwan deteriorated into an open bloody feud in December 1928. The main instigators of the rebellion were defeated in the Battle of Sabilla, on 29 March 1929. Ikhwan tribesmen and troops loyal to Abdulaziz clashed again in the Jabal Shammar region in August 1929, and Ikhwan tribesmen attacked the Awazim tribe on 5 October 1929. Faisal Al Dawish, the main leader of the rebellion and the Mutair tribe, fled to Kuwait in October 1929 before being detained by the British and handed over to Ibn Saud. Faisal Al-Dawish would die in Riyadh on 3 October 1931 from what appears to have been a heart condition. Government troops had finally suppressed the rebellion on 10 January 1930, when other Ikhwan rebel leaders surrendered to the British. In the aftermath, the Ikhwan leadership was slain, and the remains were eventually incorporated into regular Saudi units. Sultan bin Bajad, one of the three main Ikhwan leaders, was killed in 1931, while Al Dawish died in prison in Riyadh on 3 October 1931.
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.
Abdullah bin Faisal Al Saud was one of the rulers of the Emirate of Najd, also known as Second Saudi State. His reign witnessed extensive struggle among the members of the Al Saud family which led to turmoil in the region.
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 year 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 Hamid ended in the year 1796 after the defeat of Barak bin Abdul Mohsen at the hands of the First Saudi State.
The Al-Hasa Expedition was an Ottoman military campaign to annex the El-Hasa region of eastern Arabia. Ostensibly launched to assist Imam Abdullah bin Faisal in reclaiming control over Najd from his brother Saud bin Faisal, the underlying motive was Medhat Pasha's ambition to extend Ottoman dominion over the Persian Gulf.
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] 
