The Dehkhoda Dictionary, in a quote from the Encyclopedia, explicitly mentions that "Fork" was the name of the ancestor of a family in Iran, and is an Iranian name.

Still other theories attribute Fork to the founder of this village, i.e. Mozafar Keyghobad, and based on an inscription on which the year of 307 is written, they infer that as the founder of this village was initially "Pour Keyghobad", it was first called "Pourg", and then renamed to Fork and then to Forg over time.

This battle is referred to in Einolvaghaye[3]"… Esmaeil Khan, Atakhan, and their families obeyed and followed; and Afghans with Mirza Rafi Khan, Haji Fathkhan Afghan and Behboud son of Nazarkhan Ghalehgahi erected a burrow on one side of the citadel and escaped at night".

However, the Divan-e-Lame also says: "But, was it really started the building of the citadel by Mirza Bagha Khan and completed by his son, Mirza Rafi Khan (Lame's grandson) or is it one of the old buildings and these two persons and the former ones, everyone has had a hand in it and made effort to repair and complete it, is something that has not been achieved yet; not based on the written documents and not through oral promise of the elders.

It is likely that Lame and his father had possessed the citadel and it was their place of residence and administration center and shelter [5] The Book of Haghayeghol Akhbr Naseri,[6] discusses the events of the lunar year of 1268 about Mirza Rafi Khan:"In the same year, Mirza Rafi Khan, who was staying in Ghaenat places, started to oppose, General Pashakhan with two legions from city of Semnan and a collective of cavalry and forty cannons were also assigned to punish him.

Riazi Heravi writes in Einolvaghayeh Book as follows: "Forg citadel is 12 miles away from Birjand and locates around plain and entrance of "Darmian" valley and has a lot of gardens and trees and enjoys a good climate, the citadel is on the top of a mountain of which walls and towers have been firmly constructed by mud bricks and its foundation was made by Ajin stone and has two Haji Shir around itself and two embankments each of which diameter is five cubits.

MacGerger cited Forbes in his itinerary titled "A Journey to the Province of Khorasan" as follows: "The citadel has been built on the top of a hill at an altitude of 2000 to 2500 feet which could be threatened by the fire load from the highlands of the north and west.

It identified a stable, food storage areas, burrows and corridors connecting different sections of the citadel.