A Roman plaque inscribed with the word "Londiniensium" was discovered October 11 in an archaeological dig in London. Scientists suspect that it is the oldest plaque yet discovered that bears reference to the city's Roman name. A Roman plaque inscribed with the word "Londiniensium" was discovered recently in an archaeological dig in London. Scientists suspect that it is the oldest plaque yet discovered that bears reference to the city's Roman name. Found in the Southwark area of London, the marble plaque bears the name of Tiberinius and was thought to have been displayed on the wall of a merchant or residential area of town. Francis Grew, curator of archaeology at the Museum of London believes that this is a very important find, providing evidence of the existence of a merchant class in first century London.