Monarchies and ones that still use noble titles, thus there is Prince Charles because his mother is monarch. Italy no longer has a king but it has plenty of princes.
Please be more specific, the countries you want to know about....
If you mean: how many are ruled by princes (in Europe), the answer is two: Monaco and Liechtenstein. If you mean: how many know that title as part of its recognized nobility, the answer is: all kingdoms in Europe (7) plus a number of countries where this is still a recognized rank, mostly former kingdoms such as France and Italy.
princes are royal to there kingdom
The collective noun for princes is "a court of princes." This term reflects their royal status and often refers to a gathering of princes within a royal context. Other less common terms include "a suite of princes."
Princes : ameera written as : أميرة
Two Princes was created in 1990.
Barbarian Princes was created in 1999.
Border Princes was created in 2007.
Princes Pier was created in 1915.
Princes - company - was created in 1880.
The Princes of Malibu was created in 2005.
The Politeness of Princes was created in 1902.