early 19th-century. The loss of religions is also nearly complete, with only a few priestly families practising some aspects of it. While the written language (and ritualistic chants) survive in a vast number of written manuscripts, much of the spoken language is lost because the Ahom script does not mark tone and under-specifies vowel contrasts. Revivalism Though the first political organisation (All Assam Ahom Association) was created in 1893 it was in 1954 when Ahom connection to other Tai groups in Assam was formally established. Society Ban-Mong Social system The traditional social system of Tai-Ahom people was known as Ban-Mong which was related to agriculture and based on irrigation. The Ban or Ban Na is a unit composed of families that settled by the side of the rivers. While many Bans together forms a Mong which refers state. Ahom clans Ahom clans, called phoids, formed socio-political entities. At the time of ingress into Assam, or soon thereafter, there were seven important clans, called Satghariya Ahoms (Ahoms of the Seven Houses). There were Su/Tsu (Tiger) clan to which the Chao-Pha (Sukaphaa) belonged; his two chief counselors Burhagohain (Chao-Phrung-Mung) and Borgohain (Chao-Thao-Mung); and three priestly clans: Bailung (Mo-plang), Deodhai (Mo-sham), Mohan (Mo-hang) and Siring. Soon the Satghariya group was expanded—four additional clans began to be associated with nobility: Dihingia, Sandikoi, Lahon and Duarah. In the 16th-century Suhungmung added another great counselor, the Borpatrogohain and a new clan was established. Over time sub-clans began appearing. Thus during the Suhungmung's reign, the Chao-Pha's clan were divided into seven sub-clans—Saringiya, Tipamiya, Dihingiya, Samuguriya, Tungkhungiya, Parvatiya, and Namrupiya. Similarly, Burhagohain clan were divided into eight, Borgohain sixteen, Deodhai twelve, Mohan seven, and Bailung and Siring eight each. The rest of the Ahom gentry belonged to clans such as Chaodangs, Gharphalias, Likchows etc. In general, the secular aristocratic clans, the priestly class, and the gentry clans did not intermarry. Some clans admitted people from other ethnic groups as well. For example, Miri-Sandikoi and Moran-Patar were Sandikoi and Patar from the Mising and Moran communities, while the founders of Chetias and Lahons were from the Chutia community. This was true even for the priestly clans: Naga-Bailung, Miri-Bailung and Nara-Bailung. Literature The Ahoms were literate with a writing system based on the Ahom script, which fell into disuse along with the language. The Ahom script evolved from an earlier script of the Tai Nuea language which developed further under