Gerdkuh
castle in Damghan County, Iranian national heritage site
Gerdkuh was a castle of the Nizari Isma'ili state located near Damghan in the region of Qumis (modern-day Semnan Province of Iran).
Gerdkuh is a "fortified mountain"—a high vertical rock of 300 m in height with buildings on its summit and fortifications at its sides, defended by a triple ring of fortifications at its foot, making the citadel impregnable to direct military assault. It was originally a small fort acquired and refortified in 1096 AD by a Seljuq commander who was secretly a Nizari. The fortress served as a place of refuge for the families of the Nizaris, and its strategic location in the middle of the Khorasan Road made it a useful base for collecting taxes from the passing caravans of the Silk Road.
Gerdkuh resisted the Mongol invasion of 1253 AD for 17 years, becoming the last Nizari stronghold in Persia to fall. The fortress remained in use until the early Safavid period. Among the major Nizari fortresses, Gerdkuh is the least studied one.
Name
The word Girdkūh (Persian: گردکوه) is a compound of gird (گرد) for "circular" (round) and kūh (کوه) for "mountain". It is named this due to the circular shape of the mountain peak.
In the Chinese work History of Yuan, Gerdkuh is recorded multiple times, as Yü-r-gu, K‘i-du-bu, K‘i-du-bu-gu, and Gir-r-du-k‘ie, on top of the mount Yen-han, west of Tan-han (Damghan).
This brief starts where responsible research should: with the source description of “Gerdkuh” as castle in Damghan County, Iranian national heritage site. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the places & architecture register because the source frames it as castle in Damghan County, Iranian national heritage site. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Place names and jurisdictional language are key evidence: both can reveal earlier catalogue descriptions and overlooked record series. The source revision retrieved here is dated Aug 22, 2026. The linked authority identifier is Q2088795. Authority coordinates are 36.162, 54.157. None of the 1 selected statements returned an explicit reference. The first chronological checks are 1096 and 1253.
A single description cannot reconcile every naming convention, rebuilding phase or administrative transfer associated with a place. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Gerdkuh”, its source revision and the description used here.
- Expand the search: follow Gerdkuh primary sources, Gerdkuh archive and Gerdkuh research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Gerdkuh”?
- Which earlier names or jurisdictions may reveal additional records?
- Which authority defined the place, boundary or structure at the relevant date?
Search terms from this dossier
This entry incorporates text from “Gerdkuh” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.