According to Rev. 17:12, the ten horns on the beast are 10 kings.  These are the same ten horns on the beast that is mentioned in Daniel 7:7.  It just dawned on me recently since the ten horns are 10 kings then maybe the Little Horn of Dan. 7:8, is a son of a king (horn) or a crown prince meaning he is the eldest son of a king, and he will become a future king after his father the king dies.

In Rev. 6:1 we see a man on a white horse that is given a crown and he went forth conquering.  AND HE WHO WAS A  BOLDER SHIITE is an anagram for I SAW AND BEHOLD A WHITE HORSE (Rev. 6:2)

Daniel 7:8 contains two amazing anagrams.  BOLD IRAN HEAD ON THE TEMPLE THRONE; HARLOT CAUGHT ME MEN is an anagram for AND BEHOLD THERE CAME UP AMONG THEM ANOTHER LITTLE HORN (Dan. 7:8)

KEY SEAL, HE'S THE MAN ON WHITE HORSE, IRAN HEAD KING, BOLD, DEFIANT ENEMY, HE SPOUT GREAT THINGS is an anagram for AND BEHOLD IN THIS HORN WERE EYES LIKE THE EYES OF MAN AND A MOUTH SPEAKING GREAT THINGS (Dan. 7:8)

SHIA FIEND ON TEMPLE THRONE, OVER BOAST AND DEFIANT  is an anagram for AND THAT MAN OF SIN BE REVEALED, THE SON OF PERDITION (2 Thess. 2:3).   NOTED END MOST BEAST, FOE, FIEND, IRAN PAHLAVI THRONE is another anagram for AND THAT MAN OF SIN BE REVEALED, THE SON OF PERDITION (2 Thess. 2:3)

PAHLAVI, MANDATED SET REIGN is an anagram for AND PREVAILED AGAINST THEM (Dan. 7:21).  Don't forget that the beast of Rev. 13:5 is only allowed "to continue forty-two months."
AND SHIA DESPOT PAHLAVI LURES LENTEN SAINTS is an anagram for AND IN HIS ESTATE SHALL STAND UP A VILE PERSON (Dan. 11:21)

Does Iran presently have a king?  No, it is not ruled by a king.  The last king was Reza Pahlavi who passed away on July 27, 1980, but he does have a son by the same name according to this link at
https://en.wikipedia.org/wiki/Reza_Pahlavi,_Crown_Prince_of_Iran  He was born October 31, 1960.  After his father died, "he symbolically declared himself Shāhanshāh (literally King of Kings in Persian) at the age of 21."
As you well know, KING OF KINGS AND LORD OF LORDS is the title of our Lord Jesus Christ according to Rev. 19:16.  Pahlavi presently is exiled here in the United States, and lives in Maryland. When interviewed about religion, Pahlavi said, "That's a private matter; but if you must know, I am, of course, by education and by conviction, a Shia Muslim. I am very much a man of faith."  Iranian writer Reza Bayegan also notes that Crown Prince Reza is deeply attached to his Shi'a Muslim faith

Here are a couple of other articles about Pahlavi:

Reza Pahlavi was the Shah’s heir when revolution came to Iran. Could a new wave of protests lead to the exiled Crown Prince finally claiming his title 40 years on? He speaks to Rob Hastings

Read more at: https://inews.co.uk/news/long-reads/reza-pahlavi-iran-exiled-crown-prince-protests/

Reza Pahlavi, Crown Prince of Iran | Wikiwand

At one point in time Iran was part of the Seleucid Empire.