The State also includes territory from failed attempts at colonization by the European powers, such as England and the Dutch empire. The first Spanish expedition was by Francisco de Orellana in conjunction with Catholic priest Gaspar de Carvajal, who documented the expedition. He reported a conflict against indigenous women which led to the current name of the river, and then to the current name of the region and the state (Amazonas in English: Amazons). The second Spanish expedition was by Pedro de Ursúa, intending to prove the previous expedition, but resulted in the Spanish Kingdom dropping the attempt to colonize the region. After the unification of the Iberian kingdoms, Portugal launched an expedition on the river [but in reverse from Francisco de Orellana, at the mouth of the river to the site of the present-day city of Quito, capital of Ecuador], with the intention of attaching Spanish lands (comprising the current territory of the Brazilian Amazon) to the Portuguese Kingdom. After the dissolution of the Iberian Union, Portuguese and Spanish possessions in the region were undefined, resulting in internal conflicts in the region between Portugal and Spain. The Portuguese Crown later asserted the principle of uti possidetis, with respect to the region. This was the first assertion of the principle from Roman law of "uti possidetis, ita possideatis", (Latin, "who has possession, has dominion"), analogous to English common law ""Squatters rights"". Due account may have been taken of John Locke's labour theory of property. Conflicting issues arose between what was granted by law in the Treaty of Torsedillas (1494), and the subsequent reality of colonial expansion: the Spanish, eastward from the Pacific coastal plains (though restrained by the Andes), and the Portuguese, westward (aided by the waterways and lowlands of the mighty Amazon). The Treaty of Madrid (13 January 1750) – that determined the border between the Spanish possessions and southern Portuguese Brazil – had first enunciated the principle that new states, at the time of their creation shall have dominion over the lands that were settled as colonies. It implicitly opened the door to claims by prior possession in the vast lands of the north. After the independence of Brazil in 1822, the current borders of the Amazonas State were still undefined – at that time being with Gran Colombia. The internal conflicts within that neighbour country resulted in the emergence of Colombia, Ecuador, Venezuela and Panama. Brazil signed the Treaty Vásquez Cobo–Martins (1908) (with those countries) finally entitling those possessions in the north to Brazil.