Year
Event
1705
King Süa (r. 1703-1709) began excavating the first major canal in recorded history - the Khlong Khok Kham (later renamed Khlong Maha Chai) to
connect the Chao Phraya and Tha Chin Rivers. Originally dug for transport purposes, the khlong chuam maenam would play an important role in enabling
Siamese troops to repel Burmese invaders after Bangkok was established as the capital in 1782. Begun in 1705 it was dug in two parts. The first, called
Khlong Phra Phuttha Chao Luang, extended from the Chao Phraya River to Khlong Khok Kham. The second section, called Maha Chai Cholamak, ran
13.6 kilometers from Khlong Khok Kham to the Tha Chin River. The canal was completed the same year by 30,000 conscripted Thai labourers. The 16
m - wide and 3 m - deep canal provided easy passage from the Chao Phraya to the mouth of the Tha Chin at the Gulf of Thailand. A foreign engineer
was employed to survey the entire route to ensure that it ran straight and true.

[Reference: The Chao Phya, River in Transition - Steve Van Beeck (1995) - page 40/41.]
1722
The fifth Khlong Lat (short cut) on the Chao Phraya River was dug in 1722. Khlong Lat Kret Noi at the town of Pak Kret was dug reducing the journey
from 6 Km to 2 Km. The sixth Khlong Lat was below Bangkok at Ratburana, just south of Khlong Toey. A 600-metre-long canal called Khlong Pak Lat
was cut across a narrow neck, effectively cutting 19 kilometers from the journey. Unfortunately, because the Chao Phya is tide-affected, the canal
introduced saline water into the upper river, damaging marine and river-bank life. (A dam would be built across its mouth in 1784 to halt salt water
intrusion. Today, of the six Wong lat, only this one has failed to become the main channel of the river.)

[Reference: The Chao Phya, River in Transition - Steve Van Beeck (1995) - page 39.]
1752
1752 - A Siamese ambassador escorted a delegation of Siamese monks to Sri Lanka.

[Ref: The Chao Phya, River in Transition - Steve Van Beeck (1995) - Oxford University Press, New York]
1758
29 Apr
Death of King Borommakot.

[Dutch East India Company merchants at the court of Ayutthaya - Bhawan Rangsilp - page 203]
1758
1 May
Accession of King Uthumphon.

[Dutch East India Company merchants at the court of Ayutthaya - Bhawan Rangsilp - page 203]
1758
1 Jun
Abdication of King Uthumphon and accession of King Ekathat.

[Dutch East India Company merchants at the court of Ayutthaya - Bhawan Rangsilp - page 203]
1758
14 Dec
Death of Krom Phra Thephamat, the mother of King Ekathat and King Uthumphon. (Krom Luang Phiphit Montri).

[Dutch East India Company merchants at the court of Ayutthaya - Bhawan Rangsilp - page 203]
   
1700 - 1799