Singarigharutha was the traditional coronation ceremony of the king of the Ahom kingdom, a medieval kingdom in Assam. During the period of Ahom supremacy in Assam, the Singarigharutha ceremony had important constitutional significance. It was believed that even though an Ahom prince became king, he could not attain the status of full-fledged monarch until his Singarigharutha ceremony was completely performed. Therefore, each Ahom ruler after their accession to the throne tried to organize the ceremony as soon as possible. But it was not as easy since the ceremony was very expensive and there were records when some of the Ahom kings had to postpone it owing to emergency situations or due to financial crisis of the state.

The Singarigharutha ceremony was first observed by the Ahom King Sudangphaa, popularly known as Bamuni Konwar. Sudangphaa came to throne in 1397 CE. He transferred his capital from Charaideo to Charguwa. In the new capital, Sudangphaa organized the Kheun rwan mai kaw, a Tai-Ahom ceremony of coronation and claimed the mandate of Heaven to rule the Ahom Kingdom as a descendant of Lengdon or Indra, the Lord of Heaven and Earth. From that time onward, the Ahom kings performed the Singarigharutha ceremony as the main event of their coronations. The ritual was termed Singarigharutha because the wood of singari tree were used to construct the main platform on which the King sat during the procedure. Most of the Ahom rulers preferred to perform the Singarigharutha ceremony in Charaideo, which was considered very sacred by the Tai-Ahom community of Assam, since the reign of the Ahom King Sudangphaa.

To perform the ceremony, the king, at first, consulted the Tai-Ahom priests and astrologers: the Deodhai and Bailungs. An auspicious day was fixed.

On the day of ceremony, the king, wearing the Somdeo, or image of his tutelary deity, and carrying in his hand the Hengdan or ancestral sword, proceeded on a male elephant, followed by his chief queen in a female elephant, to Charaideo, where he planted a pipal tree (ficus religiosa). The royal couple next entered the Patghar, where the presiding priest poured a libation of water over them. Some Ahom chronicles stated that two people of common origin were selected and placed under the bamboo platform. When consecrated water was poured over the royal couple, it fell on the people below. The two who were under the bamboo platform were presented with gifts of gold and silver coins. Then they were exiled far from the capital, sometime even exiled from the kingdom, as it was believed that all the evil or ill omens of the new king and queen will leave with them. Such people were called Neusa-Jua which literally means the one who takes away the evils or ill omens. In olden days descendants of Neusa-Jua people were found in Goalpara district.

Afterward the royal couple took their seats in the Solongghar, on a bamboo platform, under which were placed a man and a specimen of every procurable animal. Consecrated water was poured over the royal couple and fell on the animals below. Then, having been bathed, they entered the Singarighar and took their seats on a throne. The leading nobles came up and offered their presents and homage. New money was coined, and gratuities were given to the principal officers of the state and to religious mendicants. The presents to the officers consisted of gold earrings, gold bangles and gold embroidered cloths. Deodhai-Bailungs were offered gold earrings, embroidered cloths, girdles, and long clocks, and silver, gold, cowries and cloths to the children and the people at large. On that day, prisoners convicted with minor crimes were released. The king and his chief queen stayed in the Singarighar for one full day and night.

In the evening, there was a feast which the king attended with his council of minister and noble. There was a custom that when the king sat on the royal throne engraved with dragons, with the image of Somdeo hanging down in his neck, the four principal ministers (Burhagohain, Borgohain, Borpatrogohain and Borbarua) held the four pillars or supports of the throne, signifying their importance and their support to the king. The image of Somdeo was considered very sacred to the Tai-Ahom royalty and it was very rarely exposed to common masses. During the Singarigharutha ceremony, Somdeo was shown to the Ahom nobles, to which they use to kneel down nine times. When the king came down from the nin-step dragon-engraved throne, the ministers and nobles use to salute the king seven times. After this the king was required to perform sacrifices to the gods.

Before the reign of Swargadeo Rudra Singha it had been the custom for the new king, before entering the Singarighar, to kill a man with his ancestral sword or Hengdan, but the monarch caused a buffalo to be substituted. The example was followed by his successors.

When a king was consecrated he attained the status of a full-fledged monarch. The festivities and amusements continued for seven days. On the eighth day, the image of Somdeo was returned to its shrine in the manner in which it was first brought and the king returned to the capital, with his family and nobles. During the next 30 days the tributary rulers and state officials who had not been present at the installation were expected to come in and do homage and tender their presents to the new king.