Urban VII (Giovanni Battista Castagna) (August 4, 1521 - September 27, 1590) was pope for twelve days in September 1590, was of Genoese origin, and was born in Rome. He was chosen successor of Sixtus V on September 15, 1590, but died (September 27) before consecration, making his the shortest papal reign in history.
from various public domain encyclopedias
Pope Sixtus V
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Pope Gregory XIV