It is known that Afeef-Addeen left Hijaz (in present-day Saudi Arabia) along with warriors from two tribes from Medina, namely Hawazin Bani Al-Muntafiq and Banu Tamim, and set for the conquest of the Persian South; areas that, due to their dry conditions and mountainous terrain, had remained immune to the Islamic conquests during the second Caliphate's time.

Prior to its conversion to Islam, Gerash was ruled by a Zoroastrian leader by the name of Sarem Khoora (Persian).

This prefix is set in recognition of the family's ancestry, which, as outlined above, includes Muslim warriors who contributed to the Islamic conquests of Southern Persia.

Many Gerashis have emigrated to the Persian Gulf countries such as UAE, Qatar, Bahrain and Kuwait, working in micro structural variety stores, manual commodity movements, confidential-exports by motorboats, and other similar professions.

The cost-effectiveness of Eastern Europe makes it a favorite destination for those students who have a passion for learning [5] Gerashis speak Achomi, a language shared with many neighboring cities including Evaz, Arad, Fedagh, Khonj, and Bastak.

The Gerashi variant of the Achomi language includes two accents: Nassagi (ناساگی) and Barqe-Roozi (برق روزی, commonly known as Belalizi).

[citation needed] At the time of the 2006 National Census, the city's population was 27,574 in 6,261 households,[7] when it was the capital of the former Gerash District of Larestan County.

Historically, Kalat has been home to fierce warriors who've sought refuge in the now demolished "Kalaa" or fort that was built at some point in the city's history to protect it from offenders.

This aab-anbaar has been built and dedicated by Haaj Asad-o-llah son of Karbalaei Alireza Gerashi and the brother of FathAli Khan named as Biglar Beigi Sab’eh Larestan.

According to oral accounts of past, the dome of this aab-anbaar has immediately collapsed a few days after it has been built due to raining and its ruins are visible at the bottom of the pond.

Despite, in its kind, its structure and even covering the roof of 19-metre (62 ft) diameter with traditional materials are considered as a masterpiece in architecture.

The tank is circle-shaped and the arches of water input and output channels are placed at the west side of first and fourth openings.

The “Tange Ab” dam in Gersh, Fars province, is located in a canyon with the same name in the south west part of Gerash, in the Black mountain and under the peak called “Bon-e-Morok”.

[12] The castle, whose ruins are now remained, is placed on a big pile with the height of 1,070 metres (3,510 ft) above sea level, called "Kalaat" around which the city has been developed.