Prince buried with horse: Archaeologists find a 1,400-year-old grave mystery while digging at UK nuclear site

Archaeologists working ahead of the Sizewell C nuclear power plant in Suffolk have uncovered a rare Anglo-Saxon “princely” burial, including a horse laid to rest alongside two people. The discovery was made during excavations near Leiston as part of preparatory works for the huge nuclear project. Dating to the 6th and 7th centuries, the burial is being compared to elite sites such as Sutton Hoo and Snape. Experts say the grave offers valuable new clues about power, belief and identity in early medieval England.

Princely horse burial found during Sizewell C works

The excavation is being led by Oxford Cotswold Archaeology (OCA), which has been surveying land linked to the Sizewell C development. The burial was found within one of 11 Anglo-Saxon barrows located during the project, marking the area as an important early medieval burial landscape.

The grave included a fully harnessed horse, along with weapons and personal items. Archaeologists believe the horse was an Anglo-Saxon pony about 1.4 metres tall. Burials involving horses are rare and usually associated with high-status individuals, which is why the site has been described as “princely”.

Acidic soil left 'sand skeletons' instead of bones

One of the most striking features of the find is the preservation. Because the soil is highly acidic, the bones largely dissolved. What remained were “sand silhouettes”, shadow-like outlines that show the shape of the bodies and the horse in the ground, creating haunting impressions that archaeologists had to carefully excavate and record.

The barrows date to the same broad period as major Anglo-Saxon discoveries in the region, including Sutton Hoo and Snape in Suffolk and the Prittlewell Prince burial in Essex. The comparison suggests the Sizewell burial could be part of the same wider world of wealthy and powerful early medieval communities.

One of Britain’s biggest digs

The Sizewell C excavation is part of a huge archaeological programme, with more than 200 archaeologists working across many sites before construction begins. Recent discoveries have ranged from prehistoric remains to Roman artefacts, alongside a major hoard of 11th-century silver coins found during earlier work.