text: Ferdinando II de ' Medici ( 14 July 1610 -- 23 May 1670 ) was grand duke of Tuscany from 1621 to 1670 .
simplified: Ferdinando II de ' Medici ( 14 July 1610 â `` 23 May 1670 ) was Grand Duke of Tuscany from 1621 to 1670 .