The ceety wis foondit aroond the 7t century BC bi theUmbries, in a territory inhabitit (as testifee'd bi archaeological excavations o several necropolises) as early as theBronze Age. In the 3rd century BC it wis conquered bi theRomans an suin acome a importantmunicipium leein on theVia Flaminia. The Roman name wisInteramna, meanin "in atween twa rivers". Durin theRoman Empire the ceety wis enriched wi several biggins, includinaqueducts,waws,amphitheatres,temples anbrigs.
Efter theLombard conquest (755) Terni lost ony role o prominence, reducin tae a seicontar toun in theDuchy o Spoleto. In 1174 it wis sackit biFrederick Barbarossa's general, AirchbishopChristian o Mainz. In the follaein century Terni wis ane o the favourite seat oSt. Francis' prayins.
In the 14t century Terni issued a constitution o its awn an frae 1353 the waws wur enlairgit, an new channels wur opened. As well as hintle the Italian communes o the Late Middle Ages, it wis slain bi inner disputes atweenGuelphs an Ghibellines, an later atween the twa pairties oNobili anBanderari. Later it acome pairt o thePapal States. In 1580 aairnwirk, the Ferriera, wis introducit tae wirk the airn ore mined inMonteleone di Spoleto, stairtin the tradeetional industrial connotation o the ceety. In the 17t century, housomeivver, Terni declined further due tae plagues an famines.
In the 19t century Terni teuk advantage o theIndustrial Revolution an o plentiful watter soorces in the aurie. New industries includit asteelwirk, a foondry, as well as wappens,jute an oofactories. In 1927 Terni became caipital o the province. The presence o important industries made it a favourite target for the Alleed bombardments inWarld War II, totallin 108 raids. Despite this, industrial environs increased quickly, in fact the ceety is cried "the italian Manchester".
