Rama IX (Bhumibol Adulyadej) Chakri

Buddha Yodfa Chulaloke, known as Rama I, founded the Chakri dynasty in 1782 after the fall of the Thonburi kingdom and established Bangkok as the new capital of Siam on the east bank of the Chao Phraya River. Born in Ayutthaya in 1737, he rose through military ranks under King Taksin before taking the throne himself. As king, he rebuilt Siamese administration, law, and religion after decades of war with Burma, commissioning a revised legal code and restoring Buddhist temples and texts. His son with chief consort Amarindra, Isarasundhorn, succeeded him as Rama II. He reigned until his death in 1809 and remains the dynasty's namesake, its royal house named for his pre-royal title, Chao Phraya Chakri.

Buddha Loetla Nabhalai, known as Rama II, ruled Siam from 1809 to 1824 as the second monarch of the Chakri dynasty. Born in 1767, the son of Rama I and Queen Amarindra, he is remembered chiefly as a poet-king who revived Siamese literature and classical arts after the disruptions of the eighteenth century, personally composing verse and sponsoring the royal poets of his court. He fathered two sons who would each later reign as king: Prince Jessadabodindra, by consort Sri Sulalai, who became Rama III, and Prince Mongkut, by principal queen Sri Suriyendra, who became Rama IV. He died in Bangkok in 1824.

Phra Nangklao, known as Rama III, reigned as King of Siam from 1824 to 1851, succeeding his father Rama II ahead of his more senior half-brother, the future Rama IV. Born in 1788, he expanded Siam's trade with China and, later in his reign, with Western powers, while overseeing military campaigns that secured Siamese influence over Laos and Cambodia. A devout patron of Buddhism, he sponsored the restoration and construction of numerous temples, including Wat Pho and Wat Arun in Bangkok. He never married a principal queen and left no heir positioned to succeed him, so on his death in 1851 the throne passed to his half-brother Mongkut, who became Rama IV.

Mongkut, known as Rama IV, reigned as King of Siam from 1851 to 1868. Born in 1804, the son of Rama II and Queen Sri Suriyendra, he spent 27 years as a Buddhist monk, rising to become a respected scholar of Pali scripture, science, and Western languages, before his accession at age 47 following the death of his half-brother Rama III. As king he opened Siam to Western trade and diplomacy through treaties including the 1855 Bowring Treaty, while preserving the kingdom's independence during an era of European colonial expansion in Southeast Asia. His employment of British tutor Anna Leonowens later inspired a heavily fictionalized Western portrayal of his court. His son with Queen Debsirindra, Chulalongkorn, succeeded him as Rama V.

Vajiravudh, known as Rama VI, reigned as King of Siam from 1910 to 1925. Born in 1880, the son of Rama V and Queen Saovabha Phongsri, he was educated in Britain and became a prolific writer and translator, introducing Western drama and modern Thai literature to the court. He introduced the use of surnames in Siam, established the Wild Tiger Corps paramilitary organization, and brought Siam into the First World War on the Allied side in 1917. He had no son; a daughter was born to him only days before his death in 1925, so the throne passed to his younger brother, Prajadhipok, who became Rama VII.

Prajadhipok, known as Rama VII, reigned as King of Siam from 1925 to 1935 and was the last absolute monarch of the Chakri dynasty. Born in 1893, the youngest son of Rama V and Queen Saovabha Phongsri, he came to the throne unexpectedly after his brother Rama VI died without a surviving son. His reign was transformed by the bloodless Siamese revolution of 1932, which ended absolute monarchy and established a constitutional system; he initially cooperated with the new government but, after political disputes over his powers, abdicated the throne in 1935 while in England, where he remained until his death in 1941. He married Queen Rambhai Barni and had no children.

Queen Amarindra (born Nak) was the chief consort of King Rama I and the first queen consort of the Chakri dynasty. Born around 1737 in Samut Songkhram, she married the future king before his rise to the throne and supported him through the turbulent years following the fall of Ayutthaya and the Thonburi period. As queen, she was known for her piety and patronage of Buddhist temples in the new capital of Bangkok. Her son Isarasundhorn succeeded his father as Rama II. She lived to see her son and grandson (Rama III) both reign, dying in 1826 at an advanced age, one of the longest-lived consorts of the early dynasty.

Somdet Phra Sri Suriyendra (born Boonrod) was the principal queen consort of King Rama II and mother of Prince Mongkut, who later reigned as Rama IV. Born in 1767, she was a cousin of her husband and held the highest rank among his consorts, giving her son a strong claim to the succession that was nonetheless passed over in 1824 in favor of his older half-brother, Rama III. She lived to see Mongkut spend nearly three decades as a Buddhist monk before finally ascending the throne in 1851, though she died in 1836, some years before his accession.

Somdet Phra Debsirindra (born Rampoei Sirindhara) was the principal queen consort of King Rama IV (Mongkut) and mother of his successor, Chulalongkorn, later Rama V. Born in 1834, she was a granddaughter of Rama II and thus a member of the royal family in her own right before her marriage. She died in 1861 while Chulalongkorn was still a child, seven years before he came to the throne, and did not live to see her son's reign. She is remembered as the mother of one of Siam's most celebrated modernizing kings.

Somdet Phra Sri Sulalai (born Riam) was a royal consort of King Rama II and mother of his eldest surviving son, Prince Jessadabodindra, who reigned as Rama III. Born around 1770 near Nonthaburi, she came from a family involved in the court's confectionery service rather than high nobility, and never held the rank of queen. Her son's accession in 1824, chosen by the Accession Council over more senior-born half-brothers including the future Rama IV, made her one of the most consequential royal mothers of the early Bangkok era. She was posthumously honored with the title Somdet Phra Sri Sulalai. She died in 1837.

Queen Rambhai Barni was the wife of King Rama VII (Prajadhipok), the last absolute monarch of Siam. Born a granddaughter of Rama IV in 1904, she married the future king in 1918 and became queen consort upon his accession in 1925. She accompanied him through the political upheaval of the 1932 revolution and his 1935 abdication, living with him in exile in England until his death in 1941. She had no children and returned permanently to Thailand after the Second World War, devoting her later years to charitable and educational causes until her death in 1984.