Who was the longest serving king of Thailand?
Bhumibol Adulyadej
Bhumibol Adulyadej
Bhumibol Adulyadej
Bhumibol Adulyadej
Bhumibol Adulyadej
Vajiravudh
Rama VII
Rama IX
Bhumibol Adulyadej
Vajiravudh
Phutthaloetla Naphalai
Rama VII
Bhumibol Adulyadej of Thailand
Rama IX
Rama VI
Chulalongkorn
Vajiravudh
Bhumibol Adulyadej
Bhumibol Adulyadej.
Phutthaloetla Naphalai
Rama VII
Rama IX
Chulalongkorn
Bhumibol Adulyadej of Thailand
Vajiravudh
Ananda Mahidol
Rama VI
Phutthaloetla Nabhalai
Bhumibol Adulyadej Chakri
Rama VII
Phutthaloetla Naphalai
Bhumibol Adulyadej
Bhumibol Adulyadej XVI
Bhumibol Adulyadet
Rama IX
Maha Vajiralongkorn
Bhumibol Adulyadej.
Bhumibol Adulyadej XV
Chulalongkorn
Vajiravudh
Bhumibol Adulyadej,
Phutthaloetla Nabhatra
Ananda Mahidol
Rama VI
Rama VII
Bhumibol Adulyadej of Thailand
Bhumibol Adulyadej X
Phutthaloetla Naphalai
Phutthaloetla Nabhalai
Rama IX
Bhumibol Adulyadej
Bhumibol Adulyadej Chakri
Chulalongkorn
Rama V
Vajiravudh
Bhumibol Adulyadej XVI
Bhumibol Adulyadet
Rama VI
Rama VII
Phutthaloetla Nabhatra
Phutthaloetla Narasimhadeva
Bhumibol Adulyadej.
Bhumibol Adulyadej XV
Maha Vajiralongkorn
Ananda Mahidol
Bhumibol Adulyadej,
Phutthaloetla Nabhalani
Phutthaloetla Narayan
Rama IX
Phutthaloetla Narasimha
Phutthaloetla Naphalai
Chulalongkorn
Bhumibol Adulyadej of Thailand
Bhumibol Adulyadej
Phutthaloetla Nayok
Maha Vajiravudh
Mongkut Somdet Chulalongkorn
Rama VI
Vajiravudh
Maha Vajiralongkorn Boromakot
Phutthaloetla Narasimha II
Phutthaloetla Nabhalai
Rama VII
Rama V
Rama IV
Rama VIII
Rama I
Bhumibol Adulyadej Chakri
Phutthaloetla Nabhatra
Phutthaloetla Narasimhadeva
Phutthaloetla Naphalak
Bhumibol Adulyadet
Bhumibol Adulyadej XVI
Rama IX
Ananda Mahidol
Prajadhipok
Phutthaloetla Nabhalani
Phutthaloetla Narayan
Phutthaloetla Narasimha
Bhumibol Adulyadej XV
Bhumibol Adulyadej.
Bhumibol Adulyadej XIV
Chulalongkorn
Maha Vajirunhis
Rama VI
Bhumibol Adulyadej
Bhumibol Adulyadej,
Rama VII
Phutthaloetla Nayok
Vajiravudh
Borommakot
Phutthaloetla Naphalai
Phutthaloetla Narasimha II
Mongkut Somdet Chulalongkorn
Borommakot Naresuan the Great
Rama V
Rama IV
Rama VIII
Bhumibol Adulyadej X
Phutthaloetla Nakkhatra
Rama I
Bhumibol Adulyadej of Thailand
Phutthaloetla Narasimhadeva
Maha Vajiralongkorn
Phutthaloetla Naphalak
Phutthaloetla Nabhatra
Rama IX
Chulalongkorn the Great
Maha Vajiralongkorn the Great
Mongkut
Maha Vajiravudh
Rama IX.
Ananda Mahidol
Phutthaloetla Narayan
Phutthaloetla Nabhalani
Phutthaloetla Narasimha
Rama VI
Phutthaloetla Nabha
Chulalongkorn
Emperor Chulalongkorn
Rama VII
Bhumibol Adulyadet
Maha Vajiralongkorn Boromaracha
Mahinthrathirat
Bhumibol Adulyadej XVI
Prajadhipok
Mongkut Maha Vajiralongkorn
Vajiravudh
Phutthaloetla Nayok
Borommakot Naresuan
Ananda Mahidol Maha Vajirunhis
Rama V
Phutthaloetla Narasimha II
Chulalongkorn, Rama VII
Bhumibol Adulyadej.
Bhumibol Adulyakem
Maha Vajiralongkorn, Rama VII
Rama IX of Siam
Phra Maha Vajiravudh
Rama IX
Bhumibol Adulyadej,
Phutthaloetla Nawarat
Rama IV
Rama VIII
Maha Vajiralongkorn Rama VII
Rama IX of Thailand
Borommakot Thanom Kitiyakara
Chulalongkorn the Great
Phutthaloetla Naphalak
Mongkut
Rama I
Maha Vajiralongkorn
Maha Vajirunhis
Borommakot Prajadhipok
Mongkut Maha Vajiravudh
Rama VI
Phutthaloetla Nabhatra
Rama VII
Bhumibol Adulyadej X
Chulalongkorn
Phutthaloetla Narayan
Rama IX.
Prajadhipok
Vajiravudh
Ananda Mahidol Chakravarti
Rama V
Maha Vajiralongkorn Rama VI
Phra Nangklao
Bhumibol Adulyadej
Borommakot Thanom Kittikachorn
Rama VII.
Borommakot Chakri Maha Vajirunhis
Rama IV
Rama VIII
Mahinthrathirath Ratchaburi
Bhumibol Adulyakem
Rama IX
Bhumibol Adulyadet
Rama I
Mongkut
Chulalongkorn, Rama VII