The copper coin was found on Friday evening at an excavation site in the Russian city of Veliky Novgorod located some 550 kilometres northwest of Moscow.
"The coin bears the image of a she-wolf with Romulus and Remus - the founders of Rome -- on one side and the image of a Roman goddess on the other side," Oleg Oleynikov, head of the excavation expedition, told AFP.
The find is dated to the time of the founder of Constantinople, Constantine I, at the beginning of the fourth century AD, said Oleynikov.
"This discovery is a new page in the history of ties between Constantinople and Russia of those times," said Oleynikov.
