The Iceni (/aɪˈsiːnaɪ/ eye-SEEN-eye, Classical Latin: [ɪˈkeːniː]) or Eceni were an ancient Celtic tribe of eastern Britain during the Iron Age and early Roman era.

Their territory included present-day Norfolk and parts of Suffolk and Cambridgeshire, and bordered the area of the Corieltauvi to the west, and the Catuvellauni and Trinovantes to the south.

The current Dictionary of the Welsh Language defines echen as "stock, lineage, family, tribe, source, origin, nature", cognate with Cornish eghen.

Archaeological evidence of the Iceni includes torcs — heavy rings of gold, silver or electrum worn around the neck and shoulders.

Their coins were a distinctive adaptation of the Gallo-Belgic "face/horse" design, and in some early issues, most numerous near Norwich, the horse was replaced with a boar.

[9] Sir Thomas Browne, the first English archaeological writer, in 1658 said of the Roman occupation, Boudica and Iceni coins: That Britain was notably populous is undeniable, from that expression of Caesar.

[12] In certain rural regions of Norfolk, Davies and Gregory speculate that the Iceni farmers were impacted very little by the civitas, seeing as there is a scarce presence of coinage and treasures.

On the other hand, their surveys found "coin-rich temple sites, which appear to have served as centres for periodic fairs and festivals and provided locations for markets and commercial transactions within their complexes and environs.

In such rural areas, producers and consumers would have been attracted to these sites for commerce from afield"[13] At the Norwich Castle Museum, a dedicated gallery includes a reproduction of an Iceni chariot.

While the governor, Gaius Suetonius Paulinus, was campaigning in Wales, Boudica led the Iceni and the neighbouring Trinovantes in a large-scale revolt: ...a terrible disaster occurred in Britain.

In stature she was very tall, in appearance most terrifying, in the glance of her eye most fierce, and her voice was harsh; a great mass of the tawniest hair fell to her hips; around her neck was a large golden necklace; and she wore a tunic of divers colours over which a thick mantle was fastened with a brooch.

[18]The revolt caused the destruction and looting of Camulodunum (Colchester), Londinium (London), and Verulamium (St Albans) before finally being defeated by Suetonius Paulinus and his legions.

[20] Today, a large statue of Boudica wielding a sword and charging upon a chariot, called "Boadicea and Her Daughters", can be seen in London on the north bank of the Thames by Westminster Bridge.

The rebellious Britons were subjected to harsh retaliatory measures by Suetonius Paulinus, until he was recalled and replaced by a governor with a more conciliatory approach.

[25] Toby Martin has identified the region as one in which a mass migration of these incomers likely occurred; there are particularly few Celtic toponyms in most of East Anglia.

Bertram Colgrave and Lindy Brady have argued that this passage cannot be taken literally, as these "Britons" seem to have been intended to represent figments of Guthlac's imagination rather than real people.