Following the unification of the Hejaz and Nejd kingdoms, the new state was named al-Mamlakah al-ʻArabīyah as-Suʻūdīyah (a transliteration of المملكة العربية السعودية in Arabic) by royal decree on 23 September 1932 by its founder, Abdulaziz Al Saud (Ibn Saud).
Although this is normally translated as "the Kingdom of Saudi Arabia" in English, The word "Saudi" is derived from the element as-Suʻūdīyah in the Arabic name of the country, which is a type of adjective known as a nisba, formed from the dynastic name of the Saudi royal family, the Al Saud (آل سعود).
The kingdom of Lihyan (Arabic: لحيان) or Dedan is an Ancient North Arabian kingdom.It was located in northwestern of the now-day Saudi Arabia, and is known for its Ancient North Arabian inscriptions dating to ca. Kindah was a tribal kingdom that was established in the Najd in central Arabia.It is separated from Israel and Egypt by the Gulf of Aqaba.It is the only nation with both a Red Sea coast and a Persian Gulf coast and most of its terrain consists of arid desert and mountains.One reason was to thwart Portuguese attempts to attack the Red Sea (hence the Hejaz) and the Indian Ocean.
The emergence of what was to become the Saudi royal family, known as the Al Saud, began in Nejd in central Arabia in 1744, when Muhammad bin Saud, founder of the dynasty, joined forces with the religious leader Muhammad ibn Abd al-Wahhab, A much smaller second "Saudi state", located mainly in Nejd, was established in 1824.
The Jabrids took control of the region after overthrowing the Jarwanids in the 15th century and clashed with Hormuz for more than 2 decades over the region for its economic revenues, until finally agreeing to pay tribute in 1507.
In the 16th century, the Ottomans added the Red Sea and Persian Gulf coast (the Hejaz, Asir and Al-Ahsa) to the Empire and claimed suzerainty over the interior.
2300 BC) discovered in a door-socket: "The ships of Dilmun brought him wood as tribute from foreign lands Thamud is the name of an ancient civilization in the Hejaz known from the 1st millennium BC to near the time of Muhammad.
More than 9,000 Thamudic inscriptions were recorded in south-west Saudi Arabia. 100, gave the name of Nabatene to the borderland between Arabia and Syria, from the Euphrates to the Red Sea.
The area of modern-day Saudi Arabia formerly consisted of four distinct regions: Hejaz, Najd and parts of Eastern Arabia (Al-Ahsa) and Southern Arabia ('Asir).