A burial ground was known to be in an area outside the City of London, but its exact location remained a mystery.
Thirteen bodies have been found so far in the 5.5m-wide shaft at the edge of Charterhouse Square, alongside pottery dated to the mid-14th Century.
Analysis will shed light on the plague and the Londoners of the day.
“Damaged people are dangerous. They know they can survive.” — Josephine Hart