Giant statues - said to be the oldest human shaped sculptures ever found in the Mediterranean - may once have been the guardians over an ancient graveyard.
The bizarre Bronze Age statues, thought to be over 3,000 years old, were discovered at a necropolis near Mont'e Prama in Cabras, a small town on the west of the island of Sardinia.
Dated to between the 11th and 8th centuries BC, these giants - or Kolossoi - are the oldest human-shaped sculptures found in the Mediterranean.
Experts say they are younger than ancient Egyptian statues but older than Greek kouroi statues dating from 7th century BC. The new finds will be added to discoveries first made in 1974.
The more recent excavations recovered 5,000 pieces, which include 15 heads and 22 torsos. Fully rebuilt, the statues measure 2.5 metres tall.
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The figures and other sculptures were carved in native grainy limestone and resemble others recovered in 2014, known as 'boxers' for the curved shields each bears on the left arm.
Italy's Minister of Culture Dario Franceschini said: "An exceptional discovery, which will be followed by others which has no equal in the Mediterranean."
Franceschini said of the statues: "Two new jewels are thus added to this statuary group with a mysterious charm, capable of attracting the attention of the whole world."
Expert Alessandro Usai, who has been digging at the site since 2014, said: "In particular, the two torsos found with the elongated shield that takes on a slightly enveloping shape with respect to the left arm and which flattens on the belly bring the findings back to the category of boxers."
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According to archaeologist Monica Stochino, who participated in the dig: "While the small and medium-sized fragments are brought to light daily, documented in situ on the ground and recovered, the two large and heavy blocks of the torsos will need time to be freed from the earth around them..."
She added that work remains to completely excavate the site, remove the artefacts and ultimately exhibit them. The limestone used by the ancients was easily carved, but fragile, making transportation and restoration difficult.
The Nuragic civilisation of Sardinia lasted from about 18th century BC until Roman colonisation in 238 BC.
The name Nuragic refers to Sardinia's most characteristic monument, the 7,000 circular stone 'nuraghe' forts built across the island, which bear silent witness to the ancient people who left no written records. The ancient Greeks and Romans later wrote mythical accounts about the Nuragic people.
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Nuragic people may have navigated elsewhere in the Mediterranean, ranging from what are now modern-day Spain and its islands, to mainland Italy, Crete, and even Israel. The Carthaginians from North Africa also lived on the island and may have dominated the Nuragic people.
Their tombs and monuments include standing stones resembling Britain's Stonehenge, as well as megalithic tombs known as dolmens, which are also found elsewhere in Europe.
Mont'e Prama, where the new statues were found, is a necropolis or cemetery dating from the end of the 9th century to the first half of the 8th century that features a funerary road.
It shows three phases: the first consists of simple tombs where bodies were inhumed; a second featuring grouped tombs each covered by rough stone slabs; and a third in which perfectly-aligned tombs are covered with square slabs.
The giant statues were shattered in ancient times and then deposited on top of or next to the tombs.
While the stone was quarried nearby, it is not known where the statues were originally erected before winding up at the necropolis.
Some experts believe they were used to mark off a sacred space, while others assert they were placed on slabs covering the tombs.
Opinions also differ over their destruction, with some experts asserting it came because of internal strife among the Nuragic peoples, while others blame Phoenicians of nearby Tharros on the Sinis peninsula.
Yet another theory proposes that the statues were demolished by Carthaginians, during the much later second half of the 4th century BC.
As to the identity of the giants, and their purpose and fragmentation, Usai said that he leans to the conclusion that the statues were victims of a "natural" destruction, even while he granted that further investigation based on data may eventually uncover the mystery.