Ariano Irpino
| Ariano Irpino Ariano / Ariano di Puglia | |
|---|---|
| Città di Ariano Irpino | |
| Panorama of Ariano Irpino | |
| Nickname: City of the Three Knolls | |
| Ariano Irpino within the Province of Avellino | |
| Location of Ariano Irpino | |
| Coordinates: 41°9′10″N 15°5′20″E / 41.15278°N 15.08889°E | |
| Country | Italy | 
| Region | Campania | 
| Province | Avellino (AV) | 
| Government | |
| • Mayor | Enrico Franza (PSI) | 
| Area | |
|  • Total | 186.74 km2 (72.10 sq mi) | 
| Elevation | 788 m (2,585 ft) | 
| Highest elevation | 811 m (2,661 ft) | 
| Lowest elevation | 179 m (587 ft) | 
| Population  (31 December 2024) | |
|  • Total | 20,690 | 
| • Density | 110/km2 (290/sq mi) | 
| Demonym | Arianese | 
| Time zone | UTC+1 (CET) | 
| • Summer (DST) | UTC+2 (CEST) | 
| Postal code | 83031 | 
| Dialing code | 0825 | 
| ISTAT code | 064005 | 
| Patron saint | Otho Frangipane | 
| Saint day | 23 March | 
| Website | Official website | 
Ariano Irpino (formerly known as Ariano di Puglia until 1930, and simply Ariano in historical sources and the Arianese dialect) is an Italian municipality with a population of 20,706 inhabitants located in the Province of Avellino within the Campania region.
Perched atop a highland straddling the Apennines and endowed with an expansive territory at the crossroads of ancient routes, this small town swiftly gained strategic prominence, rising from the Early Middle Ages to become the seat of both the Diocese of Ariano and the County of Ariano.
Chosen by King Roger II of Sicily as the venue for the renowned Assizes of Ariano, celebrated for the artistry of its maiolica, the town proudly bears the title of city within the farthest reaches of the regional hinterland, directly bordering Apulia.