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Siam really did not exist as a country then. First came the Kingdom of Sukhothai, established by King Indradhitaya in AD1238, after having beaten the Khoms, who were the rulers of the area at the time. The Kingdom of Ayudhya co-existed with Sukhothai at the time, after King U-Thong established the Kingdom in AD1350, and modelled it after Sukhothai and the Khoms. Sukhothai finally became part of Ayudhya in AD1438, thereby began the building of the Siamese Kingdom. The Kingdom of Siam extended in all directions over time, moved its capital city to Thonburi after the fall of Ayudhya, and finally to the Bangkok we see today since AD1782.
Timeline of British Monarchs
World History
for comparison
The Sukhothai Period
The Anasazi in southwest Colorado, USA began building their cliff dwellings (1200)
King Indradhitaya
1238-?
Henry III (1216-72)
Genghis Khan, Mongol conqueror, died in his sleep (1227)
King Balmuang
?-1279
Edward I (1272-1307)
Rudolf of Hapsburg was elected emperor in Germany, Marco Polo crossed Afghan Turkistan (1273)
King Ramkamhaeng the Great
1279-1299
Marco Polo visited the country of Ziamba (Viet-Nam) (1280)
King Leotai
1299-1348
The Ayudhya Period
Edward II (1307-27)
Shoes began to be made for both right and left feet (1310)
King Litai (Dharmaraja I)
1348-1369
King Ramathibodi I (U-Thong )
1350-1369
Edward III (1327-77)
By 1352 the Black Death had killed 25 million people in Europe alone
King Saiyaleotai (Dharmaraja II)
1370-1388
King Ramesuan (1st Kingship)
1369-1380
Richard II (1377-99)
Hongwu, the first Ming emperor, established an imperial kiln at Jungdezhen in south-central China (1369)
King Boromrajadhiraj I (Kunluang Pa-ngua)
1380-1388
King Charles VI of France was crowned at age 12 (1380)
King Dharmaraja III
1388-1419
King Thonglan (Thongchandra)
1388 (7 days)
Queen Margrete I of Denmark (1387-1412)
King Ramesuan (2nd Kingship)
1388-1395
Cosimo de Medici, Florentine merchant banker (1389-1464)
King Ramrajadhiraj I
1395-1409
Henry IV (1399-1413)
Seoul, Korea, was founded (1394)
King Dharmaraja IV
1419-1438
King Nakarintradhiraj (Pra Nakorn Indra)
1409-1424
Henry V (1413-22)
An English army under Henry V defeated the French at Agincourt, France (1415)
End of Sukhothai Period
1438
King Boromrajadhiraj II (Chao Saam Praya)
1424-1448
Henry VI (1422-61)
Joan of Arc condemned as a heretic, was burned at the stake in Rouen, France (1431)
Became part of Ayudhya Kingdom
King Boroma Trilokanaj
1448-1488
Edward IV (1461-70)
The period of the Inca Empire (1450-1532)
For Thai version, click link
Henry VI (1470-71)
The game of golf was played in Scotland at the Old course at St. Andrews (1473)
to Thai Heritage site
Edward IV (1471-83)
Sandro Botticelli painted "The Birth of Venus" (1480)
Richard III (1483-85)
Christopher Columbus convinced Queen Isabella to fund expedition to the West Indies (1486)
King Boromrajadhiraj III (Pra Indracha)
1488-1491
Henry VII (1485-1509)
The Medici went bankrupt (1490s)
King Ramathibodi II (Pra Chethadhiraj)
1491-1529
Henry VIII (1509-47)
Christopher Columbus sets sail for the west (1492)
King Boromrajadhiraj IV (Pra Boromraja Hno Puttangkul)
1529-1533
The Ottoman Sultan Suleiman re-entered Buda and established John Zapolyai as the puppet king of Hungary (1529)
King Rasdadhiraj
1533 (5 months)
Francisco Pizarro captured Cuzco and completed his conquest of Peru (1533)
King Chaiyarajadhiraj
1534-1546
Quito, Ecuador, was founded by Spanish, and The Ottoman Empire extended from Hungary to Baghdad (1534)
King Yodfah (Pra Kaew Fah)
1546-1548
Edward VI (1547-53)
Henry VIII founded Christ Church, Oxfords largest college (1546)
Kun Worawongsa Dhiraj (Pan Butr Sri Dhep)
1548 (42 days)
Court jesters, mainly dwarfs and cripples, appeared in Europe (1549)
  King Maha Chakrabatr (Pra Tier Raja)
1548-1568
Lady Jane Grey (1553)
Helsinki was founded by the Swedes (1550)
 
Mary I (1553-58)
King Mahindra Dhiraj
1568-1569
Elizabeth I (1558-1603)
Burmese King Bayinnaung invaded Siam and took as hostage Princess Suphankalaya (1569)
King Maha Dhamaraja Dhiraj (Sanpetch I)
1569-1590
Sweden gave up her claim to Norway (1570)
King Naresuan the Great (Sanpetch II)
1590-1605
James I (1603-25)
Shakespear's wrote A Midsummer's Nights Dream (1595)
King E-ka Tosaros (Sanpetch III)
1605-1610
Shakespeare wrote the tragedy "King Lear" (1606)
King Sri Saowapak (Sanpetch IV)
1610-1611
Parliament of Paris appointed Louis XIII as French king (1610)
King Songtam (Pra Indra Raja)
1611-1628
Charles I (1625-49)
The Mayflower lands at Plymouth Rock, MA with pilgrims (1620), 1st Thanks Giving in USA (1621)
King Chettha Dhiraj
1628 (8 months)
Massachusetts colony was founded by Englishmen (1628)
King Athitayawongsa
1628 (38 days)
Rembrandt Harmenszoom van Rijn, Dutch painter, painted "Self Portrait Leaning Forward" (1628)
King Prasatthong (Sanpetch V)
1629-1656
Oliver Cromwell (1649-58)
Indians introduced pilgrims to popcorn at Thanksgiving (1630)
King Chai (Sanpetch VI)
1656 (9 months)
Artificial pearls were 1st manufactured by M. Jacquin in Paris (1656)
King Sri Sutham Raja (Sanpetch VII)
1656 (2 months)
A pendulum clock was designed by Christian Huygens and built by Solomon Coster (1657)
King Narai the Great (Ramathibodi III)
1656-1688
Richard Cromwell (1658-59)
Chinese Ming dynasty occupied Taiwan (1661)
Charles II (1660-85)
Theatre Royal in Drury Lane, London, opened (1663)
King Petraja
1689-1703
James II (1685-88)
Peter the Great became tsar of Russia (1689)
William III, Mary II (1689-1702)
The "Man in the Iron Mask," a prisoner in Bastille prison in Paris, died (1703)
King Sua
1703-1708
Anne (1702-14)
English-Scottish parliament accepted Act of Union and formed Great Britain (1707)
King Tai Sra (Sanpetch IX)
1708-1732
George I (1714-27)
The Tatler magazine in England published its 1st edition (1709)
King Boroma Kos (Boromrajadhiraj V)
1732-1758
George II (1727-60)
Robert Walpole became the 1st British PM to live at 10 Downing Street (1735)
King Utumporn
1758 (1 month)
The French began bombardment of Madras, India (1758)
King Suriyasna Amarindra (King Ekatat)
1758-1767
George III (1760-1820)
Catharine II, Russian Tsarina, grabbed power (1762)
Thai Heritage site for Thai version
The Thonburi Period
King Taksin the Great
1768-1781
Madame du Barry became King Louis XV's "official" mistress (1769)
Marie Antoinette married the future King Louis XVI of France (1770)
The Ratanakosin Period
King Rama I (Phutthayotfa Chulalok)
1782-1809
The United States and Britain signed preliminary peace articles in Paris, recognizing American independence and ending the Revolutionary War (1782)
King Rama II (Phutthaloetla Naphalai )
1809-1824
George IV (1820-30)
Sweden declared independence and a constitutional monarchy was established (1809)
King Rama III (Nangklao)
1824-1851
William IV (1830-37)
The 1st steam locomotive was introduced (1824)
King Rama IV (Mongkut)
1851-1868
Victoria (1837-1901)
The first piano accordion appeared in Paris, and Seattle, USA, began as a sawmill (1852)
King Rama V (Chulalongkorn)
1868-1910
Edward VII (1901-10)
Thomas Edison patented his 1st invention, an electric voice machine (1868)
King Rama VI (Vajiravudh)
1910-1925
George V (1910-36)
WWI (1911-20)
King Rama VII (Prajadhipok)
1925-1934
Edward VII (1936)
Actor Paul Newman was born in Cleveland (1925)
King Rama VIII (Ananda Mahidol)
1934-1946
George VI (1936-52)
WWII (1939-45)
King Rama IX (Bhumibol Adulyadej)
1946-present
Elizabeth II (1952-present)
The League of Nations went out of business (1946)
link to Timelines of History, where this column of info. came from