|Custodian of the Two Holy Mosques|
|? ? |
Kh?dim al-?aramayn a?-?ar?fayn (in Arabic)
|Style||CTHM, Your Majesty|
|First monarch||Salahuddin Al Ayyubi|
|Residence||King's Palace, Riyadh|
Custodian of the Two Holy Mosques (abbreviation CTHM; Arabic: ? ? , Kh?dim al-?aramayn a?-?ar?fayn), Servant of the Two Noble Sanctuaries or Protector of the Two Holy Cities, is a royal style that has been used by many Muslim rulers, including the Ayyubids, the Mamluk Sultans of Egypt, the Ottoman Sultans, and in the modern age, Saudi Arabian kings. The title refers to the ruler taking the responsibility of guarding and maintaining the two holiest mosques in Islam: Al-Haram Mosque (Arabic: ?, romanized: Al-Masjid al-?ar?m, "The Sacred Mosque") in Mecca and the Prophet's Mosque (Arabic: , romanized: Al-Masjid an-Nabaw?) in Medina, both of which are in the Hejazi region of the Arabian Peninsula.
After defeating the Mamluks and gaining control of the Mecca and Medina in 1517, the Ottoman Sultan Selim I adopted the title. Rather than style himself the kimü'l-?aremeyn (Arabic: ? , Ruler of The Two Holy Cities), he accepted the title dimü'l-?aremeyn (Arabic: ? , Servant of The Two Holy Cities). This title was used by all subsequent Ottoman Caliph Sultans until Mehmed VI (1861-1926), the last.
The first King of Saudi Arabia to assume the title was Faisal bin Abdul Aziz (1906-1975). His successor Khalid did not use the title, but the latter's successor Fahd did, replacing the term "His Majesty" with it. The current king, Salman bin Abdulaziz Al Saud, took the same title after the death of King Abdullah, his half brother, on 23 January 2015.