Spain's request to the Pope led to the expansion of Spanish authority, sparking tensions with Portugal, which had its own territorial ambitions. On June 7th, 1494, the Treaty of Tordesillas was signed between King Ferdinand II of Aragon and Queen Isabella I of Castile and King John II of Portugal establishing a new dividing line between the two crowns. According to the treaty, all lands to the east would belong to Portugal, while lands to the west would belong to Spain.