Sixtus V

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Sixtus V, 

1. Biographical (Felice Peretti) 1521–90, Italian ecclesiastic: pope 1585–90.

Collins Concise English Dictionary © HarperCollins Publishers::

Sixtus V noun

1. original name Felice Peretti. 1520–90, Italian ecclesiastic; pope (1585–90). He is noted for vigorous administrative reforms that contributed to the Counter-Reformation