Serene Highness
（重定向自Durchlaucht）
His/Her Serene Highness (abbreviation: HSH) is a style used today by the reigning families of Liechtenstein and Monaco. Until 1918 it was also associated with the princely titles of members of some German ruling and mediatised dynasties, and with a few princely but non-ruling families. It was also the form of address used for cadet members of the dynasties of France, Italy, Russia and Ernestine Saxony under their monarchies. Additionally, the treatment was granted for some, but not all, princely yet non-reigning families of Bohemia, Hungary, Italy, Poland, Romania and Russia by emperors or popes.