that the British were involved in the 1921 coup was noted as early as March 1921 by the American embassy and relayed to the Iran desk at the Foreign Office. A British Embassy report from 1932 concedes that the British put Reza Shah "on the throne". After his establishing of power and strengthening of the central government, Rezā Khan quickly put an end to the autonomous activities of the British-backed Sheikh Khazal in the south. London withdrew its support of Khaz'al in favor of Rezā Shāh. A novel chapter in Anglo-Iranian relations had begun when Iran canceled its capitulation agreements with foreign powers in 1928. Iran's success in revoking the capitulation treaties, and the failure of the Anglo-Iranian Agreement of 1919 earlier, led to intense diplomatic efforts by the British government to regularize relations between the two countries on a treaty basis. On the Iranian side negotiations on the widest range of issues were conducted by Abdolhossein Teymourtash, the Minister of Court from 1925 to 1932, and Iran's nominal Minister of Foreign Affairs during the period. The ire of the British Government was raised, however, by Persian diplomatic claims to the oil-rich regions of the Greater and Lesser Tunbs islands, Abu Musa and Bahrain in the Persian Gulf region. On the economic front, on the other hand, Iran's pressures to rescind the monopoly rights of the British-owned Imperial Bank of Persia to issue banknotes in Iran, the Iranian Trade Monopoly Law of 1928, and prohibitions whereby the British Government and Anglo-Persian Oil Company ("APOC") were no longer permitted to enter into direct agreements with their client tribes, as had been the case in the past, did little to satisfy British expectations. The cumulative impact of these demands on the British Government was well expressed by Sir Robert Clive, Britain's Minister to Tehran, who in 1931 noted in a report to the Foreign Office "There are indications, indeed that their present policy is to see how far they can push us in the way of concessions, and I feel we shall never re-establish our waning prestige or even be able to treat the Persian government on equal terms, until we are in a position to call a halt". Despite the enormous volume of correspondence and protracted negotiations that took place between the two countries on the widest array of issues, on the Iranian side, Teymourtash conducted these negotiations single-handedly “without so