Sukaphaa, also Siu-Ka-Pha,"...the advance of the Tais under Sukapha (Siu-Ka-Pha) was a historical fact and is well documented by records and traditions." was a Tai ruler traditionally credited with founding the Ahom kingdom in medieval Assam. He is identified as a Tai prince from Möng Mao,"The choice fell on him not only for his qualities as a military leader, but also for his privileged birth in the Chao-pha (noble-celestial) or royal clan from which alone a Tai segmentary society could customarily choose its chief. More precisely, he belonged to the Tiger (Su/Tsu) clan of the Mao-Shan sub-tribe." and conventional chronologies date his entry into the Brahmaputra valley to 1228 CE"...it is not until Sukapha became king in 1228 AD..." . The chronology of his migration, reign and early settlement, however, is disputed: Buranji accounts preserve conflicting dates, while later reconstructions have proposed several alternative dates, generally placing the migration in the mid-14th century. The kingdom associated with his foundation existed until 1826 and came to incorporate large parts of modern Assam. In reverence to his position in Assam's history, the honorific Chaolung is associated with his name (Chao: lord; Lung: great). In 1996, the Assam Government decreed his annual remembrance on 2 December as Sukaphaa Divas, or Asom Divas (Assam Day), to commemorate his advent and entry into Assam.
Traditional genealogy The details of Sukaphaa's ancestry and early life, available from different chronicles, both Ahom and non-Ahom, are full of contradictions. According to , who has tried to hold up a consistent account, Sukaphaa was born to Chao Chang-Nyeu (alias Phu-Chang-Khang) and Nang-Mong Blak-Kham-Sen in the Tai state of Möng Mao (also called Mao-Lung, with the capital at Kieng Sen), close to present-day Ruili in Yunnan, China. According to the Buranji by Kashinath Tamuli Phukan, Chao Tai Pung ruled Mong Mao and had two sons, Pao Meo Pung (who finally ruled Mong Mao) and Phu Chang Khang (who finally ruled Mong Mit). Sukaphaa was born to Phu Chang Khang. This version is discounted by . Chao Chang Nyeu was a prince from Mong-Ri Mong-Ram, who had travelled to Mong Mao possibly on an expedition. Mong Mao was then ruled by Chao Tai Pung. Chao Chang Nyeu was later befriended by Pao Meo Pung, the son of the ruler, who gave his sister Blak Kham Sen in marriage. As per this account, Sukaphaa was born of this union not later than 1189 CE and was brought up by his maternal grandparents. The same account states that Pao Meo Pung, who eventually ruled Mong Mao, had no male heir and Sukaphaa, his nephew, was nominated to succeed him. A son born late to Pao Meo Pung's queen ended Sukaphaa's claim to the throne of Mong Mao.
Journey into Assam The following route and dates belong to the conventional Buranji-based reconstruction. In this account, Sukaphaa left Mong Mao in 1215.Most Buranjis attest to this version. Some Tai chronicles from outside Assam record the journey of Sukaphaa from Mong Mit (and not Mong Mao) in 1227 where he was the ruler . According to this version, Sukaphaa's father had earlier divided his Mong among his three sons, and Sukaphaa became the ruler of Mong Mit about 1209. The immediate cause of departure was the aggression of Su-Khan-Pha of Mong Mao. He was accompanied by three queens, two sons and a daughter; chiefs from five other dependent Mongs;Mong-Hkang, Mong-Hkru-Dai, Mong-Hka Mong-Pun, Mong-Phu and Mong-Li . members of the priestly class and soldiers—a total contingent of 9,000. Some commoners are recorded as having joined this core group on the way. The migrating group also expanded by capturing people along the route; according to Saikia, these captives included Chutia, Morans and Barahis.“Along the way, a number of people were captured and brought along with. They were either Chutias, Morans, Barahis—thus the migrating band expanded.”“Along the way, a number of people were captured. They were either Chutias, Morans, [or] Barahis ... given names according to the task they performed.” Sukaphaa had with him 300 horses fitted with saddles and bridles and two elephants. Heavy arms were transported along a different route. Sukaphaa followed an older known route from Yunnan to Assam that passed through Myitkyina, Mogaung and the upper Irrawaddy River valley. On his way, he stopped at various places and crossed the Khamjang River to reach the Nangyang lake in 1227. Here he subjugated the Nagas very ferociously and established a Mong. According to the Buranjis, Sukaphaa's passage through the Patkai involved repeated attacks on Naga villages. Several villages were forced to surrender or were abandoned after his forces attacked them, while resistant Nagas were subjected to severe exemplary punishments, including being forced to eat the flesh of their own relatives. He left one Kan-Khrang-Mong there to guard the passage back, and proceeded to cross the Patkai hills at the Pangsau Pass and reached Namrup (in the Brahmaputra Valley) in December 1228. In this reconstruction, the journey from Mong Mao to Namrup took about thirteen years, and 1228 is treated as the year in which the Ahom kingdom was established.
Disputed chronology of Migration The conventional chronology places Sukaphaa's departure from Möng Mao in 1215 and his arrival at Khamjang in 1228."Sukāphā is said to have left Maulung in 1215 A.D. ... For thirteen years he wandered about the hilly country of the Pātkāi ... and in 1228 A.D. he arrived in Khāmjāng." The chronological basis of these dates, however, is disputed."Like his ancestry, his original homeland, and the reason of his leaving it, Sukapha's date of birth and the date of his invasion of Assam are also bones of contention to the scholars in the field. [...] There being no means to confirm these early dates of the Buranjis, no scientific and comprehensive study has been made on the topic." Daniels (2012) notes that, although the Ahoms are reputed to have migrated to Assam during the thirteenth century, “we have no contemporary source that can elucidate their early history.” The textual basis of the early migration narrative is also uncertain. Although Buranji tradition attributes the beginning of official chronicle writing to Sukaphaa, research on the Tai Ahom script suggests that the written chronicle tradition took shape much later. The oldest surviving Ahom text, the Snake Pillar inscription, dates to the reign of Suhungmung (1497–1539), while modern-day linguistics studies show that the Ahom script developed between the late 14th and 16th centuries."Although tradition suggests that the Ahom brought their script with them when they crossed the Patkai Mountains into Assam in the 13th century from Mong Mao, located on the frontier of what is now Myanmar and China (Phukan 2006); it is unknown how old the script actually is. The oldest surviving Ahom text, the Snake Pillar inscription, only dates back to the time of King Siuw Hum Miung who reigned during 1497-1539 (Hosken and Morey 2012). However, the resemblance between the Ahom script and one of the extant Shan scripts known as lik hto ngouk, or “bean-sprout letters”, points to a common origin (Cushing 1888; Ferlus 1988; Diller 1992; Wichasin 1986). A recent paper by Daniels (2012) refers to a manuscript published in Yang, Bartholemew and Wang (2000). This has been identified as a Chinese manuscript dated 1407 that includes Tai language very similar in form and structure to the Tai Ahom script, suggesting that a script like Tai Ahom was in use in the Mong Mao kingdom by the end of the 14th century at the latest.""There is a general consensus that the proto-Shan script that developed into the modern Shan and Ahom scripts was adapted from the Burmese script sometime between the late 14th and the 16th century. Ferlus (1988) and Diller (1992) also argue that lack of orthographic contrasts between original voiced and voiceless consonants suggests that the adaptation took place later than the first half of the 13th century. In addition, Pain (2017) adds the use of digraph ui, to represent /ɯ/ in Shan and Ahom as further evidence for the Old Burmese origin. Furthermore, Daniel’s (2012) analysis of the 1407 manuscript discussed above postulates that the adaptation occurred in the 14th century. The shapes of 14 letters attested in the text as well as the use of diacritical -y-, -r-, and -w- points to an Old Burmese origin."
Saikia (1997) describes an “utter confusion” in the chronology of the presumed Tai-Ahom migration and settlement in the Lauhitya valley. The first two chronicles of the Satsari Assam Buranji give incompatible sequences: the first places the westward migration in 1215 and the initial settlement in 1228, while the second dates the departure to Śaka 1170 (1248 CE), the establishment of the first village fourteen years later in 1262, and Sukaphaa's death to Śaka 1190 (1268 CE). The first also assigns him a reign of thirty-three years after the occupation of Dikhoumukh, whereas the second makes him leader of the group for forty-two years from its departure from the Nara kingdom. Three other Buranjis date Sukaphaa’s accession to 1362 CE, while other accounts preserve still different chronologies.
Saikia attributes part of the problem to the Tai-Ahom dating system, which used a recurring sixty-year tao singa cycle composed of named lakni years. Since the Buranjis generally do not identify the particular cycle to which a lakni belonged, she regards their conversion into fixed Common Era dates as uncertain. She further argues that the lakni dates inserted into the first Satsari chronicle—the version supporting 1228—were sometimes incorrectly placed or apparently invented without reference to the Tai-Ahom calendar and therefore cannot be relied upon for reconstructing the early chronology.
Saikia (2004) links the chronological problem to the late compilation and transmission of the Sukaphaa traditions. She states that the Ahom royal genealogy beginning with Sukaphaa was fixed during the reign of Rajeswar Singha (1751–1769), while Gaurinath Singha (1780–1795) later sent pandits to Upper Burma to collate accounts of earlier rulers from Buddhist temple records, particularly those concerning Sukaphaa. This may explain the common origin narrative repeated in later Buranjis, although it is no longer possible to determine whether they drew upon one source or several. Sukaphaa, or related figures, also appears in the ancestral traditions of several Shan groups in Upper Burma with differing dates, genealogies and political roles, but neither the origin of these traditions nor the direction of their transmission can now be established. John F. Hartmann similarly considered the chronology beginning with the first Tai-Ahom ruler “probably too early by as much as 200 years” and noted that the official accounts of the early period were later “refreshed” with Tai-Mau and Khamti chronicles obtained through continued contact with those groups.
Saikia notes that scholars such as N. N. Acharyya fixed 1228 as the beginning of Tai-Ahom rule partly through astronomical reconstruction based on an eclipse recorded during Susenpha's reign. Acharyya identified it with the partial solar eclipse of 6 March 1486 and, by working backwards through the royal succession using an assumed average reign of 21 years for each preceding ruler, concluded that the conventional early-thirteenth-century chronology was broadly plausible. R. C. Kapoor subsequently argued that the 1486 eclipse was not visible from Assam and that the chronicle description better fits the total solar eclipse of 9 July 1488, which was visible there.