Abdullah bin Abdul Rahman was prominent in the military campaigns of his elder half-brother Abdulaziz as he laid the foundations of the future state of Saudi Arabia.{{cite journal|author=Christopher Keesee Mellon|title=Resiliency of the Saudi Monarchy: 1745-1975 However, Abdullah continued to be the key counsellor of the King, a member of the privy council, and one of the king's official advisors until the King's death in 1953. He was a participant at the meeting with the British prime minister
Winston Churchill in 1945,{{cite journal|title=Riyadh. The capital of monotheism|journal=Business and Finance Group|url=http://www.bfg-global.com/pdfnw/pdf/eng/1-ensalman.pdf|url-status=dead|archive-url=https://web.archive.org/web/20091014223725/http://www.bfg-global.com/pdfnw/pdf/eng/1-ensalman.pdf Abdullah was part of the council of ministers with the title of chief advisor to King Saud.{{cite thesis|author=George T. Fitzgerald On 6 January 1965 Prince Abdullah accompanied Saud in the latter's declaration of allegiance to King Faisal.{{cite journal Abdullah bin Abdul Rahman was among five senior princes who met immediately after the
assassination of King Faisal and proclaimed then Crown Prince Khalid the king of Saudi Arabia.{{cite news|title=Saudi's King Faisal assassinated|newspaper=Sarasota Journal|date=25 March 1975 ==Views, personal life and death==