VEIO, Italy — A man suspected of raiding tombs turned police informant and led archaeologists to what experts described yesterday as the oldest known frescoed burial chamber in Europe.

The tomb, on a hilly wheat field north of Rome, belonged to a warrior prince from the nearby Etruscan town of Veio, said archaeologists who took journalists on a tour of the site.

Dating from about 690 B.C., the underground tomb is decorated with roaring lions and migratory birds. Experts are hailing it as the earliest example of the funerary decorations that would later become common in the Greek and Roman world.

"This princely tomb is unique, and it marks the origin of Western painting," Culture Minister Francesco Rutelli said.

Authorities were led to the site in May by an Italian man on trial for trafficking in illegally excavated artifacts. He revealed the location of the tomb in hopes of gaining leniency from the court, said Carabinieri Gen. Ugo Zottin, who heads the paramilitary police squad assigned to art theft.

Zottin declined to reveal the man’s identity or discuss details of his collaboration.

"Sometimes the smugglers arrive before the archaeologists, but luckily they could not remove the frescoes," Rutelli said.

Looters who plundered the tomb overlooked several objects hidden by the collapse of part of the chamber’s redpainted ceiling.

Besides the frescoes, archaeologists have uncovered decorated vases imported from Greece, a sword, and metal spits used to roast meat for the prince’s table. A two-wheeled bronze chariot was found in front of the archway that leads into the burial chamber.

The recovery of elegant broaches, a wool spindle and other objects usually used by females suggests that at least one woman, possibly the prince’s wife, had been buried in the tomb, said Francesca Boitani, the lead archaeologist on the dig.

The urns containing the cremated remains of the tomb’s owners, normally placed in one of the chamber’s niches, are thought to have been taken by looters, Boitani said.

The images of birds and cats remain the highlight of what experts are calling "The Tomb of the Roaring Lions."

Although decorated caves predate by millennia the Etruscan tomb, experts say it is the oldest example in the Western world of a specially built funerary chamber decorated with murals.

"Prehistoric paintings are something else," Boitani said. "Here we see used for the first time the techniques described in ancient texts and used in Western civilization in the following centuries."

Murals have been found in some burial chambers in Turkey, but those date back to the 6 th century B.C., while the Etruscan tomb is at least a century older, said Giovanni Colonna, an expert on the Etruscan civilization at Rome’s La Sapienza University.

The architecture of the tomb, the style of the paintings and the images of lions — an animal not seen in central Italy — show that the builders were influenced by art coming from Greece, Egypt and Asian kingdoms, Colonna said.

Although the same art is used on Greek vases of the time, no decorated tombs from that period have been found in Greece or elsewhere in Europe, he said.

The images in the Etruscan tomb were outlined in black and red with mineral-based paints, and archaeologists think they were fixed on the wall using a compound created by crushing fossils found in the area.

The birds are symbols of the passage into the afterlife, while the lions "represent the horror for what lies beyond life," said Anna Maria Moretti, superintendent for antiquities in areas around Rome.

The surrounding hills are likely to hide additional tombs, but it will be difficult to conduct further digs because of a lack of money, she said.

The prosperous town of Veio was for centuries a rival of Rome — just 10 miles away — finally succumbing to the invading legions in 396 B.C., a fate soon shared by the rest of the Etruscan civilization.

Lavish tombs the Etruscans left behind riddle the region north of Rome, and their treasures are often prey for looters.

Artifacts found in the newly discovered tomb are likely to go to Rome’s Villa Giulia National Museum, the city’s top repository for Etruscan art, Moretti said. Archeologists working to restore the frescoes hope the tomb will be open to the public in the future but no date has been set, she said.