 Later, the 1481 Papal Bull "Aeterni regis" granted all lands south of the Canary Islands to Portugal, while in May 1493 the Spanish-born Pope Alexander VI decreed in the Bull "Inter caetera" that all lands west of a meridian only 100 leagues west of the Cape Verde Islands should belong to Spain while new lands discovered east of that line would belong to Portugal.A further Bull, "Dudum siquidem", made some more concessions to Spain, and the pope's arrangements were then amended by the Treaty of Tordesillas of 1494 negotiated between Spain and Portugal.After the discovery of the Americas, many of the clergy sent to the New World began to criticize Spain and the Church's treatment of indigenous peoples.