History of the Cyclades have been found on Naxos. The operation of silver mines on Siphnos may also date to this period. At the end of the 19th century, the Greek archaeologist Christos Tsountas, having assembled various discoveries from numerous islands, suggested that the Cyclades were part of a cultural unit during the 3rd millennium BC: the Cycladic civilisation, dating back to the Bronze Age. It is famous for its marble idols, found as far as Portugal and the mouth of the Danube, which proves its dynamism. It is slightly older than the Minoan civilisation of Crete. The beginnings of the Minoan civilisation were
Minoan sealstone Minoan sealstone Minoan seal-stones are carved gemstones produced in the Minoan civilization. They have been found in quantity at specific sites, for example in Knossos, Mallia and Phaistos. Minoan seal-stones are of a small size, 'pocket-size', in the manner of a personal amulet. They might be thought of as equivalent to the pocket-sized, scaraboid seals of Ancient Egypt. However Minoan seals can be larger, with largest examples of many inches. These include with animals, dance, and goddesses. One common iconographic motif in Minoan art, especially frescoes, is bull-leaping; the example illustrated shows leapers and a bull. Other themes are varied,