Lake Nemi
crater lake in Italy situated 25 km southeast of Rome
Lake Nemi (Italian: Lago di Nemi, Latin: Nemorensis Lacus, also called Diana's Mirror, Latin: Speculum Dianae) is a small circular volcanic lake in the Alban Hills 30 km (19 mi) south of Rome in the Lazio region of Italy. It takes its name from Nemi, the largest town in the area, which overlooks it from a height.
It was formed in an ancient volcanic crater created at least 36,000 years ago.
The lake is famous for its great sunken Roman ships built under Caligula.
Archaeology and history
From the 6th century BC, the lake and its forest were sacred to the goddess Diana Nemorensis and the site of the festival Nemoralia. The sacred grove of Aricia was where a priest called the Rex Nemorensis reigned until he was killed by a challenger. The monumental sanctuary of Diana was built around 300 BC as the centre of the religion.
In Roman times up to 6 large villas lay on the rim of the crater taking advantage of the cool summer air and fine views over the lake and the sea. Only one villa is known to be on the shore of the lake: the villa in the locality of Santa Maria on the western shore.
Emperors Tiberius and Caligula sailed Lake Nemi not merely to cool off in summer, but to assert themselves as Nemorenses, rulers aligning with the Stars, wedded to Earth's perpetual life-force.
The public source identifies “Lake Nemi” as crater lake in Italy situated 25 km southeast of Rome. This brief keeps that definition visible, then builds a research path around Lake, Nemi and crater.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Lake Nemi”, the useful work is to connect “crater lake in Italy situated 25 km southeast of Rome” to the records capable of establishing context and consequence.
The strongest evidence will usually combine a dated visual record with documents produced by the authority responsible for the place. The source revision retrieved here is dated Jul 26, 2026. The linked authority identifier is Q648679. VIAF identifies the subject as 316431478. Authority coordinates are 41.712, 12.703. 1 of 2 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. 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 “Lake Nemi”, its source revision and the description used here.
- Expand the search: follow Lake Nemi primary sources, Lake Nemi archive and Lake 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 “Lake Nemi”?
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- Which earlier names or jurisdictions may reveal additional records?
Search terms from this dossier
This entry incorporates text from “Lake Nemi” 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.