A group of archaeology and history students made a "one in a million" find when they uncovered an ancient monument the Greek historian Plutarch had written about, their professor said.

The monument commemorates a battle in east-central Greece in 86 B.C. at which the Romans defeated invaders from Asia Minor.It was uncovered last February by students from the University of California, Berkeley, said John Camp, a Berkeley professor of archaeology and co-director of U.S. excavations in Greece. Camp reported the find Sunday at a meeting of the Archaeological Institute of America.

Plutarch, who lived from about 46 to 120 A.D., referred to the battle at Chaironeia and the monument in his book "Life of Sulla," a biography of the Roman general.