Family and Office
Tsotne belonged to the Dadiani family, hereditary eristavi (dukes) of Odishi, later known as Mingrelia or Samegrelo, in western Georgia. His father was Shergil Dadiani and his mother was Nateli; his wife was Khuashak, daughter of Bega, eristavi of Kartli. He had at least three sons, named George, Ioane, and Erashahr.
The House of Dadiani was among the leading noble houses of Georgia, and would become the most powerful feudal house in western Georgia by the 1280s, with branches governing regions including Svaneti, Guria, and Bedia. Tsotne himself rose to high state office, serving as mandaturtukhutsesi (Lord High Steward) and eristavt-eristavi (Duke of Dukes).