sentences:  Joel S. Panzer views "Sicut dudum" as a significant condemnation of slavery, issued sixty years before the Europeans found the New World.Eugene tempered "Sicut dudum" with another bull (15 September 1436) due to the complaints made by King Duarte of Portugal, that allowed the Portuguese to conquer any unconverted parts of the Canary Islands.The king suggested that Portugal be authorized to evangelize and civilize the islands, as other less reputable persons were unlikely to heed the pontiff.