c. AD 15
Dallinghoo hoard
The hoard of 840 gold coins discovered here in 2008 is the largest find of Iron Age coins in Britain since the 19th century. Mainly Freckenham-type staters (named after another Suffolk hoard) produced by the Iceni tribe between 20 BC and AD 15. This hoard, a massive 4.58kg of gold, may represent an Icenian royal treasury abandoned perhaps after an invasion by their southern neighbours, the Trinovantes tribe, centred on Colchester.
The hoard is now in Ipswich Museum:
https://cimuseums.org.uk/
Further reading
Talbot, J. and Leins, I., ‘Before Boudicca: the Wickham Market hoard and the middle phase gold coinage of East Anglia’, British Numismatic Journal vol. 80, 2010, 1-23
Martin, E., ‘The Iron Age in Suffolk’ in J. Davies and T. Williamson (eds.), Land of the Iceni. The Iron Age in Northern East Anglia, Studies in East Anglia History 4, University of East Anglia, Norwich, 1999, 44-99.