But she pushed the study forward, especially in the use of bronze coins, which had previously been neglected.

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The coins are mainly bronze, with some silver content, and feature 16 different emperors, spanning 38 years.

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The coins, mainly bronze Nummi, were found in layers within the clay jar, with those at the top dating from between 333-335 AD, and the coins at the bottom at least 10 years older.

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The find includes three bronze cannons, thousands of Spanish and Portuguese gold coins, and several tonnes of elephant tusks.

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Items also declared treasure by Norfolk's assistant deputy coroner David Osborne included an Anglo-Saxon silver pin found in Scoulton, a Middle Bronze Age Gold Bead discovered in Salthouse and a hoard of 59 silver Roman coins that date from the Roman Republic to Tiberius, the second emperor of Rome.

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