<Li> Duke of Nemours </Li> <Li> Marquess of Castellina </Li> <Tr> <Th> Style (s) </Th> <Td> "His / Her Royal Highness" "His / Her Excellency" "Don" </Td> </Tr> <Tr> <Th> Founded </Th> <Td> 1169; 849 years ago (1169) </Td> </Tr>

Who were the medicis and why were they important