Abdullah bin Jassim bin Mohammed Al Thani ( "Abdullah bin Jassim bin Mohammed Al Thani"), also known as Sheikh Abdullah bin Jassim Al Thani or Sheikh Abdullah bin Qassim Al Thani, was the Emir of Qatar. He was born in 1880 in Doha, the capital city of Qatar. He then abdicated in favour of his crown prince and second son, Sheikh Hamad bin Abdullah Al Thani, in 1940. Sheikh Hamad died eight years later and Sheikh Abdullah assumed office once again until 1949, when he stepped down from office in favour for his eldest son, Sheikh Ali bin Abdullah Al Thani. Oil was also discovered for the first time during his rule. Biography Early life and reign Sheikh Abdullah bin Jassim Al Thani was born in the year 1880, in Doha, the capital city and state of Qatar, as a son of Sheikh Jassim bin Mohammed Al Thani. Although his mother is still unknown, he was born along with his eighteen siblings, with him being the 5th eldest among his siblings. He then ruled Qatar until 1940. Sheikh Abdullah's heir apparent, Sheikh Hamad bin Abdullah Al Thani, ruled Qatar from 1940 until his early death in 1948. Sheikh Abdullah became the ruler of Qatar once again until 1949, when he abdicated in favour of his eldest son. Sheikh Ali bin Abdullah Al Thani, his eldest son, then ruled Qatar after his father's abdication. Contributions Ottoman Empire and Great Britain era Great Britain and the Ottoman Empire accorded their recognition to Sheikh Abdullah and his successors' right to rule over the whole of the Qatari Peninsula. The Ottomans renounced all their rights to Qatar and following the outbreak of the First World War; Sheikh Abdullah forced the Ottomans to abandon Doha on 19 August 1915. Treaties for protection On 3 November 1916, Britain, to bring Qatar under its Trucial System of Administration, signed a treaty with Sheikh Abdullah. While Sheikh Abdullah agreed not to enter into any relations with any other power without prior consent of the British Government, Percy Zachariah Cox, the Political Resident in the Persian Gulf, who signed the treaty on behalf of his government, guaranteed the protection of Qatar 'from all aggression by sea'. On 5 May 1935, Sheikh Abdullah was able to obtain Britain's agreement for the protection of Qatar from inside as well as any attacks from external forces. Structures built In 1927, Sheikh Abdullah