Year
Event
1247
ca.
Ca. 1247 Pha Mueang, the lord of the small principality of Mueang Rat, gathered an army and joined with those of a neighbouring Siamese ruler, Bang
Klang Hao of Mueang Bang Yang, who had not submitted to the Khmer. After reducing nearby Bang Khlang and Satchanalai, they marched on the main
Khmer outpost in the region at Sukhothai. The Khmer gave battle but were defeated, and Pha Mueang entered the city. Pha Mueang then presented his
conquest to his ally, Bang Klang Hao, together with his own title and sword, and he presided over the new Sri Indraditya’s coronation as king of
Sukhothai.

[Reference: Wyatt, David K. (2003) - Thailand, A short history (2nd Ed.) - Silkworm Books - page 43]
1259
ca.
Ban Mueang ascends the throne of of Sukhothai ca. 1259 - ca. 1279.

[Reference: Wyatt, David K. (2003) - Thailand, A short history (2nd Ed.) - Silkworm Books]
1279
Death of King Ban Mueang of Sukhothai and throne ascendance of King Ramkhamhaeng (reign ca. 1279-1298).

[Reference: Wyatt, David K. (2003) - Thailand, A short history (2nd Ed.) - Silkworm Books]
1289
Lopburi, known to the Chinese as Lo-hu send tribute mission to China. This missions were sent aside from economic aims, with the intention of seeking
political support from China. On one of these missions Lopburi was reported to have petitioned the Chinese emperor to order Sukhothai to stop attacking
its territory.

[Reference: The Rise of Ayudhya - Charnvit Kasetsiri - (1976) - Page 80]
1291
Lopburi send tribute mission to China.

[Reference: The Rise of Ayudhya - Charnvit Kasetsiri - (1976) - Page 80]
1292
Sukhothai, known to the Chinese as Hsien, send tribute mission to China.

[Reference: The Rise of Ayudhya - Charnvit Kasetsiri - (1976) - Page 80]
1296
Lopburi send tribute mission to China.

[Reference: The Rise of Ayudhya - Charnvit Kasetsiri - (1976) - Page 80]
1298
Death of Ramkamhaeng of Sukhothai and throne ascendance of King Lo Thai (reign 1298-1346/7). Sukhothai went into rapid decline and lost all political
influence in the area of the Menam Basin immediately south of its borders, as many of its dependencies broke away and became independent. [Griswold
and na Nagara placed the death of Ramkhamhaeng in 1298 from the evidence that a mission came to China from Sukhothai to report the death of a king
and the beginning of a new reign. See Griswold and na Nagara, Epigraphic and Historical Studies, No. 10, pp. 21-2. ]

[Reference: The Rise of Ayudhya - Charnvit Kasetsiri - (1976) - Page 80; Wyatt, David K. (2003) - Thailand, A short history (2nd Ed.) - Silkworm
Books]
1299
1299 - Lopburi send tribute mission to China.

[Reference: The Rise of Ayudhya - Charnvit Kasetsiri - (1976) - Page 80]
   
1200 - 1299