Hussein, King of Hejaz in the context of "Arab Kingdom of Syria"

The Sharifian Caliphate (Arabic: الخلافة الشريفية, romanized: al-Khilāfat al-Sharīfiyya) was a Caliphate proclaimed by the Sharifian leaders of the Hejaz in 1924, replacing the Ottoman Caliphate, which was abolished by the Grand National Assembly of Turkey. Even though the Banu Hashim held the caliphate at various points in history, Hussein bin Ali, the Sharif of Mecca, was the first and last caliph of this lineage.

In the Arab world, it represented the culmination of a long struggle to reclaim the caliphate from Ottoman hands. The first Arab revolts challenging the validity of the Ottoman caliphate and demanding that an Arab Sayyid be chosen as caliph can be traced back to 1883 when Sheikh Hamat-al-Din seized Sanaa and called for the caliphate as a Sayyid.

The Hashemite Kingdom of Hejaz (Arabic: المملكة الحجازية الهاشمية, romanized: Al-Mamlakah al-Ḥijāziyyah Al-Hāshimiyyah) was a state in the Hejaz region of Western Asia that included the western portion of the Arabian Peninsula that was ruled by the Hashemite dynasty. It was self-proclaimed as a kingdom in June 1916 during the First World War, to be independent from the Ottoman Empire, on the basis of an alliance with the British Empire to drive the Ottoman Army from the Arabian Peninsula during the Arab Revolt.

The British government had promised Hussein bin Ali, King of Hejaz, a single independent Arab state that would include, in addition to the Hejaz region, modern-day Jordan, Iraq, and most of Syria, with the fate of the Palestine region (today's Israel and Palestine) being mentioned in more ambiguous terms. However, at the end of the First World War, the Treaty of Versailles turned Syria into a French League of Nations mandate and Iraq, Mandate Palestine and Transjordan into British mandates. Hashemite princes were installed as monarchs under the British mandates in Transjordan and Iraq; this became known as the Sharifian solution.

Abdülmecid II or Abdulmejid II (Ottoman Turkish: عبد المجید ثانی, romanized: ʿAbdü'l-Mecîd-i sânî; Turkish: II. Abdülmecid; 29 May 1868 – 23 August 1944), commonly known as Abdülmecid Efendi, was the last Ottoman caliph, the only caliph of the Republic of Turkey, and head of the Osmanoğlu family from 1926 to 1944. Unlike previous caliphs, he used the title Halîfe-i Müslimîn ("Caliph of the Muslims"), instead of Emîrü'l-Mü'minîn ("Commander of the Faithful").

He was also a relatively famous artist and a Turkish aesthete, interested in art, mainly literature, painting, and music, and ways to promote it in Turkey. After the abolition of the Ottoman caliphate, he was succeeded for several months by Hussein bin Ali, the Sharif and Emir of Mecca and King of the Hejaz, who was mostly recognized in the Arab world.

Faisal I bin Hussein bin Ali al-Hashimi (Arabic: فيصل بن حسين بن علي الهاشمي, romanized: Fayṣal bin Ḥusayn bin ʻAlī al-Hāshimī; 20 May 1885 – 8 September 1933) was a Hejazi statesman who served as the King of Iraq from 23 August 1921 until his death in 1933. A member of the Hashemite family, he was a leader of the Great Arab Revolt during the First World War, and ruled as the unrecognized King of the Arab Kingdom of Syria from March to July 1920 when he was expelled by the French.

The third son of Hussein bin Ali, the Grand Emir and Sharif of Mecca, Faisal was born in Mecca and raised in Istanbul. From 1916 to 1918, with British assistance, he played a major role in the revolt against the Ottoman Empire. He helped set up an Arab government in Syria, based in Damascus, and led the Arab delegation at the Paris Peace Conference in 1919. In 1920, the Syrian National Congress proclaimed Faisal king, rejecting the French claim to a Mandate for Syria. In response, France invaded a few months later, abolished the kingdom and forced him into exile.

The flag of the Arab Revolt (Arabic: علم الثورة العربية), also used as the flag of Hejaz (Arabic: علم مملكة الحجاز), was a flag used by Hussein bin Ali and his allies, the Arab nationalists, during the Arab Revolt against the Ottoman Empire during World War I, and as the first flag of the Kingdom of Hejaz. It was designed by Mark Sykes, but has palettes reminiscent of previous Arab flags, such as the flags of the al-Muntada al-Adabi, al-ʽAhd and al-Fatat.

The flag consists of three horizontal stripes (black, white, and green) and a red triangle on the hoist side, using Islamic religious tradition, each color has a symbolic meaning: black represents the Abbasid dynasty or the Rashidun caliphs, white represents the Umayyad dynasty, and green represents Islam (or possibly, but it is not certain, the Fatimid dynasty). The red triangle represents the Hashemite dynasty, to which Hussein bin Ali belonged.