His involvement in the politics and government of Mingrelia began in October 1804, when he became a member of the regency council for his underage relative, Levan V Dadiani, a grandson of Katsia II.
In 1805, Didi-Niko Dadini led a Mingrelian delegation to St. Petersburg sent to address the principality's territorial grievances with its neighbors.
[1] During his years in government, Dadiani wrote his major historical work, The History of the Georgians (ქართველთ ცხოვრება, k'art'velt' ts'khovreba), which he completed in 1823.
It is composed of three parts; the first two segments are based, respectively, on the medieval compendium, kartlis tskhovreba, and the history by Prince Vakhushti.
The final part is an original work, dealing mostly with the history of western Georgia between 1749 and 1823 and containing many valuable, otherwise unrecorded details.