The head from a statue of a Roman God has been unearthed at Binchester Roman Fort near Bishop Auckland in County Durham.
It was found by a student at the dig, which attracts volunteers and archaeology students from around the world.
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Sandiford, a former legal secretary originally from Redcar, was convicted of drug smuggling offences and sentenced to death in 2013.
Durham Crown Court heard that one of the male victims suffered a triple-fractured jaw, while left lying in the gutter, unconscious.