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Royal Titles Simplified
Generation 1 KING
Wife of 1 +Royal wife (Queen)
Somdetch Pra
+Non-royal wife
Chao Chom
Gen 2 Chao Fa
(HRH Prince/Princess)
Pra Ong Chao
(HRH Prince/Princess)
Gen 2 + wife Chao Fa
+Royal wife
Chao Fa
+Non-royal wife (Mom)
Pra Ong Chao
+Non-royal wife (Mom)
Pra Ong Chao
+Royal wife
Gen 3 Pra Ong Chao
(HH Prince/Princess)
Mom Chao - M.C.
(HSH Prince/Princess)
Mom Chao - M.C.
(HSH Prince/Princess)
Pra Ong Chao
(HH Prince/Princess)
Gen 4 Mom Chao - M.C.
(HSH Prince/Princess)
Mom Rajawongse - M.R. Mom Rajawongse - M.R. Mom Chao - M.C.
Gen 5 Mom Rajawongse - M.R. Mom Luang - M.L. Mom Luang - M.L. Mom Rajawongse - M.R.
Gen 6+ Mom Luang - M.L. add Na Ayutthaya to
surname
add Na Ayutthaya to
surname
Mom Luang - M.L.
Gen 7+ add Na Ayutthaya to
surname
add Na Ayutthaya to
surname
Note: The title of Pra Ong Chao has been simplified in this example, as the title can be that of Pra Chao Vorawongse Ther
Pra Ong Chao, or Pra Vorawongse Ther Pra Ong Chao, depending on the rankings of the parents.  It is also common to see
a royal of lesser rank upgraded to one of the Pra Ong Chaos. 
1. HRH - His/Her Royal Highness
2. HH - His/Her Highness
3. HSH - His/Her Serene Highness
4. Mom - The title for non-royal wives of the Highnesses (1-3)
5. Mom Rajawongse (M.R.) and Mom Luang (M.L.) are considered non-royals, thus are not given Royal
    Highnesses.  These titles are also different to the title of Mom in 4.
*If 1-3 (female) marries a commoner, she must reliquish her royal title