The wooden tablets contain the earliest surviving written reference to London, and the earliest dated handwritten document from Britain: January 8, 57 -- less than 14 years after the Roman invasion.
The tablets reveal correspondence requesting payments, boasting of money-lending, asking favours to be returned, litigation requiring a judge and also evidence of someone practising the alphabet.
They also show early London was inhabited by businessmen and soldiers, many from Gaul and the Rhineland.
The tablets were found beneath Bloomberg's new European headquarters by the Bank of England.
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Romans used waxed writing tablets for note-taking, accounts and legal documents. Writing was carved into the wax, and sometimes the scratches were deep enough to score the wood beneath.
The wooden tablets survived because they were buried in the mud of the Walbrook, a lost river running right through the City of London financial district, still defined by the Roman wall boundary.
Previously only 19 legible tablets had been found in London. Of the 405 discovered under the new Bloomberg building, 87 have been deciphered.
They reveal the names of nearly 100 people, from a brewer to a judge, soldiers, slaves and freed slaves making their way in business.
The address was written on the back of the tablets.
On one dated to circa 65-80 is written "Londinio Mogontio", or "In London, to Mogontius", a Celtic personal name, and is the earliest reference to London by 50 years.