section_path: History/Portuguese era
section_name: Portuguese era
paragraph_text: Portuguese era
  
  The harsh desert environment led to the emergence of the "versatile tribesman", nomadic groups who subsisted due to a variety of economic activities, including animal husbandry, agriculture and hunting. The seasonal movements of these groups led not only to frequent clashes between groups but also to the establishment of seasonal and semi-seasonal settlements and centres. These formed tribal groupings whose names are still carried by modern Emiratis, including the Bani Yas and Al Bu Falah of Abu Dhabi, Al Ain, Liwa, and the west coast; the Dhawahir, Awamir, Al Ali, and Manasir of the interior; the Sharqiyin of the east coast; and the Qawasim to the north.
  
  With the expansion of European colonial empires, Portuguese, English and Dutch forces appeared in the Persian Gulf region. By the 18th century, the Bani Yas confederation was the dominant force in most of the area now known as Abu Dhabi, while the Northern Al Qawasim (Al Qasimi) dominated maritime commerce. The Portuguese maintained an influence over the coastal settlements, building forts in the wake of the bloody 16th-century conquests of coastal communities by Albuquerque and the Portuguese commanders who followed him – particularly on the east coast at Muscat, Sohar and Khor Fakkan.
  
  The southern coast of the Persian Gulf was known to the British as the " Pirate Coast ", as boats of the Al Qawasim federation harassed British-flagged shipping from the 17th century into the 19th. The charge of piracy is disputed by modern Emirati historians, including the current ruler of Sharjah, Sheikh Sultan Al Qasimi, in his 1986 book The Myth of Arab Piracy in the Gulf.
  
  British expeditions to protect their Indian trade routes led to campaigns against Ras Al Khaimah and other harbours along the coast, including the Persian Gulf campaign of 1809 and the more successful campaign of 1819. The following year, Britain and a number of local rulers signed a maritime truce, giving rise to the term Trucial States, which came to define the status of the coastal emirates. A further treaty was signed in 1843 and, in 1853 the Perpetual Maritime Truce was agreed. To this was added the 'Exclusive Agreements', signed in 1892, which made the Trucial States a British protectorate.
  
  Under the 1892 treaty, the trucial sheikhs agreed not to dispose of any territory except to the British and not to enter into relationships with any foreign government other than the British without their consent. In return, the British promised to protect the Trucial Coast from all aggression by sea and to help in case of land attack. British maritime policing meant that pearling fleets could operate in relative security. However, the British prohibition of the slave trade meant an important source of income was lost to some sheikhs and merchants.
  
  In 1869, the Qubaisat tribe settled at Khor Al Adaid and tried to enlist the support of the Ottomans. Khor Al Adaid was claimed by Abu Dhabi at that time, a claim supported by the British. In 1906, the British Political Resident, Percy Cox, confirmed in writing to the ruler of Abu Dhabi, Zayed bin Khalifa Al Nahyan ('Zayed the Great') that Khor Al Adaid belonged to his sheikhdom.