Pope sixtus IV timeline By Rieth.wetnhiak 1414 Birth of pope sixtus IV 1471 Election as pope will make major infrastructure improvements in Rome 1478 Pope sixtus launching Spanish Inquisition in Castile 1481 Pope sixtus orders Christian prince to go against slavery 1483 Pope sixtus officially opens introduces the new Sistine chapel that he has built 1483 Pope sixtus launching the Spanish Inquisition 1484 Death of pope sixtus IV