Other finds to have emerged recently from the Palatine's largely unexplored palaces and temples include an ancient Roman sewer, insignia believed to have belonged to the emperor Maxentius, terra-cotta statues and an alabaster tiger striped with gray marble.
Officials said the resurfaced treasures highlight the importance of a hill so favored by the rich and powerful that its name is at the origin of the words "palace" in English, "palais" in French and "palazzo" in Italian.
Today rainwater seeps through stones, roots bore through bricks and retaining walls crack under layer after layer of construction, from the eighth-century B.C. remains of Rome's first fledgling huts to a medieval fortress and Renaissance villas.
Only a quarter of the Palatine's nearly 500 buildings are above the ground and just 40 percent of the hill's 67 acres can be visited.
The latest closure came in November 2005, when a 16th-century wall collapsed one night in a well-visited area near the emperor Tiberius' palace. No one was hurt, but the collapse prompted authorities to study the stability of the hill and its monuments.
Experts said Tuesday they are considering restoring the ancient Roman sewage system to help drain rainwater.
Each year, 4 million people buy a ticket granting access to the Palatine and the nearby Colosseum, but 90 percent of them just go to the ancient arena, said Culture Minister Francesco Rutelli.
The minister said that $9 million will be available in 2007 for more restoration on collapse-prone areas such as Tiberius' palace.
