initiated diplomatic discussions over the rights to possess and govern the newly found lands. Spanish and Portuguese delegates met and debated from April to November 1493, without reaching an agreement. Columbus was still in Lisbon when he sent a report of his success to the Spanish monarchs. On 11 April, the Spanish ambassador conveyed the news to Pope Alexander VI, a Spaniard and the former Administrator of Valencia, and urged him to issue a new bull favorable to Spain. At the time, Pope Alexander, as ruler of the Papal States, was embroiled in a territorial dispute with Ferdinand's first cousin, Ferdinand I, King of Naples, hence he was amicable to any requests of Isabella and Ferdinand, to the extent that they could write to Columbus saying that if he thought it necessary, one of the bulls would be modified. They were at Barcelona, in close touch with Rome. The camera apostolica became almost an extension of the Spanish Court, which secured a rapid succession of bulls virtually liquidating Portuguese claims. The Pope issued edicts dated . The third superseded the first two. A final edict, Dudum siquidem of , supplemented the Inter caetera. The first bull, Inter caetera, dated 3 May, recognized Spain's claim to any discovered lands not already held by a Christian prince, and protected Portugal's previous rights. Both parties found this too vague. The second bull, Eximiae devotionis, also dated 3 May, granted to the kings of Castile and León and their successors the same privileges in the newly discovered land that had been granted to the kings of Portugal in the regions of Africa, and Guinea. The third bull, also entitled Inter caetera, dated 4 May, exhorts the Spanish monarchs to spread the faith west from a line drawn "one hundred leagues towards the west and south from any of the islands commonly known as the Azores and Cape Verde". Diffie notes that it has been suggested that this change may have been prompted by the Portuguese ambassador. The Inter caetera and the following Treaty of Tordesillas defined and delineated a zone of Spanish rights exclusive of Portugal. In relation to other states the agreement was legally ineffective (res inter alios acta). Spain's attempts to persuade other European powers on the legal validity of the Inter caetera were never successful. Provisions Inter caetera states: Among other works well pleasing to the Divine Majesty and cherished of