Who was the longest serving king of Thailand?
Bhumibol Adulyadej
Vajiralongkorn
Chulalongkorn
Vajiralongkorn
Chulalongkorn
Vajiralongkorn
Vajiravudh
Chulalongkorn
Vajiralongkorn
Vajiravudh
Chulalongkorn
Prajadhipok
Ananda Mahidol
Vajiralongkorn
Vajiravudh
Chulalongkorn
Prajadhipok
Ananda Mahidol
Vajiralongkorn
Vajiravudh
Mongkut
Chulalongkorn
Prajadhipok
Ananda Mahidol
Vajiralongkorn
Mongkut
Vajiravudh
Chulalongkorn
Prajadhipok
Ananda Mahidol
Vajiralongkorn
Mongkut
Rama V
Vajiravudh
Prince Chulalongkorn
Rama VI
Chulalongkorn
Maha Vajiravudh
Prajadhipok
Ananda Mahidol
Rama V
Mongkut
Vajiralongkorn
Vajiravudh
Chakri Sirindhorn
Rama VI
Prince Chulalongkorn
Chulalongkorn
Prajadhipok
Taksin Shinawatra
Maha Vajiravudh
Chulalongkorn.
Vajiravudh.
Prajadhipok of Thailand
Ananda Mahidol
Rama V
Mongkut
Sihanouk
Vajiralongkorn
Rama VI
Vajiravudh
Chulalongkorn
Prajadhipok
Maha Vajiravudh
Chulalongkorn.
Taksin Shinawatra
Rama IX
Rama V
Vajiravudh.
Prajadhipok of Thailand
Ananda Mahidol
Mongkut
Bhumibol
Sihanouk
Rama VI
Vajiralongkorn
Vajiravudh
Chulalongkorn
Maha Vajiravudh
Chulalongkorn.
Rama V
Rama IX
Vajiravudh.
Prajadhipok of Thailand
Bhumibol
Chulalongkorn II
Prajadhipok
Taksin Shinawatra
Rama VI
Sihanouk
Taksin
Vajiralongkorn
Vajiravudh
Mongkut
Chulalongkorn
Rama V
King Bhumibol
Chulalongkorn.
Naresuan
Maha Vajiravudh
Bhumibol
Rama VI
Naresuan the Great
Vajiravudh.
Prajadhipok of Thailand
Chulalongkorn II
Taksin Shinawatra
Sihanouk
Rama IX
Chakri Sihanouk
Taksin
Vajiravudh
Vajiralongkorn
Prajadhipok
Chulalongkorn
Rama V
King Bhumibol
Chulalongkorn.
Rama VI
Mongkut
Bhumibol
Naresuan
Sihanouk
Chulalongkorn II
Taksin Shinawatra
Maha Vajiravudh
Naresuan the Great
Vajiravudh
Prajadhipok
Vajiralongkorn
Rama V
Chulalongkorn
Taksin
Rama IX
King Bhumibol
Sihanouk of Thailand
Chulalongkorn.
Sihanouk the Great
Mongkut
Bhumibol
Sihanouk
Vajiravudh.
Taksin Shinawatra
Prajadhipok of Thailand
Chulalongkorn I
Naresuan
Queen Sirikit
Rama V
Rama VI
Rama V.
Vajiravudh
Taksin
Rama IX of Thailand
Vajiralongkorn
Chulalongkorn
Naresuan the Great
Rama IX
Prajadhipok
Bhumibol
Chulalongkorn.
Chulalongkorn II
Taksin Shinawatra
Taksin the Great
Maha Vajiravudh
Prince Chulalongkorn.
Rama V
Rama VI
Mongkut
Rama V.
Taksin
Chulalongkorn
Vajiralongkorn
Sihanouk the Great
Mongkut I
Bhumibol
Prajadhipok
Chulalongkorn.
Chulalongkorn II
Vajiravudh
Chulalongkorn I
Rama IX
Taksin Shinawatra
Vajiravudh.
Taksin
Mongkut
King Bhumibol
Rama V.
Taksin the Great
Sihanouk II
Bhumibol Aquino
Sihanouk III
Mongkut II
Chulalongkorn
Vajiralongkorn
Bhumibol
Rama V
Rama VI
Prajadhipok
Rama IX of Thailand
Rama IX.
Chulalongkorn.