The Sussex chicken is a dual purpose breed that originating in England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

 around the time of the Roman

Roman Empire

The Roman Empire was the post-Republican period of the ancient Roman civilization, characterised by an autocratic form of government and large territorial holdings in Europe and around the Mediterranean....

 conquest of Britain

Roman conquest of Britain

The Roman conquest of Britain was a gradual process, beginning effectively in AD 43 under Emperor Claudius, whose general Aulus Plautius served as first governor of Britannia. Great Britain had already frequently been the target of invasions, planned and actual, by forces of the Roman Republic and...

 in AD 43 that is a popular backyard chicken

Chicken

The chicken is a domesticated fowl, a subspecies of the Red Junglefowl. As one of the most common and widespread domestic animals, and with a population of more than 24 billion in 2003, there are more chickens in the world than any other species of bird...

 in many countries. They come in eight colors (with a couple more being developed) and have a bantam

Bantam (chicken)

A bantam is a small variety of poultry, especially chickens. Etymologically, the name bantam is derived from the city of Bantam - currently known as "Banten Province" or previously "Banten Residency" - once a major seaport, in Indonesia...

 version at 1/4 size; the bantams may be any of the eight colors.

A Sussex breed club

Breed club

Breed clubs are associations or clubs with activities centered around a single, specific breed of a particular species of domesticated animal. The purpose of the association will vary with the species of animal and the goals and needs of the members of the association...

 was formed in 1903.
The colors found in Sussex chickens are: Brown, Buff, Light, Red, Speckled, Silver, White and Coronation.