<P> In addition to the long running dispute between Abu - Dhabi and Dubai, Dubai was also involved in a dispute with Sharjah with regards to their legal boundaries . Before the British left, there were no exact boundaries defined between the Trucial States; however, with the discovery of oil needing boundaries to be decided for concession reasons, Britain was required to define the boundaries . After Julian Walker, a British official (later the British political agent) had surveyed the area, Mr. Tripp, the British political agent, made declarations between 1956 and 1957 defining the boundaries . Although the rulers of both Dubai and Sharjah had agreed in 1954 to accept the rulings made, Dubai's ruler declined to accept the decision . Even after the formation of the UAE, neither state had agreed on the boundaries and hence, on 30 November 1976 they signed an arbitration compromise under the auspices of the Supreme Council of the Federation . Eventually, the Supreme Council ruled that the decisions were administrative, binding decisions as opposed to arbitral awards, the Tripp boundaries were defined as the border . </P> <P> The following is a list of rulers of Dubai, Al - Maktoum dynasty, going back at least to 1833 . </P> <Ul> <Li>... - 9 June 1833 Sheikh ` Ubayd ibn Said </Li> <Li> 9 June 1833 - 1852 Sheikh Maktoum I bin Bati ibn Suhayl (d . 1852) </Li> <Li> 1852 - 1859 Sheikh Said I ibn Bati (d . 1859) </Li> <Li> 1859 - 22 November 1886 Sheikh Hushur ibn Maktoum (d . 1886) </Li> <Li> 22 November 1886 - 7 April 1894 Sheikh Rashid I bin Maktoum (d . 1894) </Li> <Li> 7 April 1894 - 16 February 1906 Sheikh Maktoum II bin Hushur (b . 18...- d . 1906) </Li> <Li> 16 February 1906 - November 1912 Sheikh Bati bin Suhayl (b . 1851 - d . 1912) </Li> <Li> November 1912 - 15 April 1929 Sheikh Saeed II bin Maktum (1st time) (b . 1878 - d . 1958) </Li> <Li> 15 April 1929 - 18 April 1929 Sheikh Mani bin Rashid </Li> <Li> 18 April 1929 - September 1958 Sheikh Saeed II bin Maktum (2nd time) </Li> <Li> September 1958 - 7 October 1990 Sheikh Rashid II ibn Said Al Maktoum (b . 1912 - d . 1990) </Li> <Li> 7 October 1990 - 4 January 2006 Sheikh Maktoum III bin Rashid Al Maktoum (b . 1943 - d . 2006) </Li> <Li> 4 January 2006--Present Sheikh Mohammed bin Rashid Al Maktoum (b . 1949) </Li> </Ul> <Li>... - 9 June 1833 Sheikh ` Ubayd ibn Said </Li>

When did nomadic tribes first settled in the region and begin trading