The existence of Sindos during the ancient ages is comfirmed by Herodotos who mentioned in his texts that Xerxis, the Persian king moored his ships in Thermi (Thessaloniki) in the cities Halastra and Sindos. The information verifies that Sindos was a coastline city, probably situated by Ehedoros river, on the eastern bank of the river, since the coast section of the western bank was a swamp. All this leads us to the consumption that Sin-dos was in fact a coastline city, situated northern than where it stands today. Sindos was one of the 26 cities that the king of Thessaloniki, Kassandros united into one and it was then that the inhabitants of Sindos and the inhabitants of the neighboring city Halastra immigrated to Thessaloniki. The fact that for many ages there is no reference to Sindos in any historical text does not mean that the city vanished, but as it happens in several simi-lar occasions the immigration to a greater city left this one to the shadows. Sindos continued existing as a small village with few inhabitants that gradually developed as the newly founded city of Thessaloniki was developing. The first inhabitants in Sindos were the race of Pelasgians. In the course of history Sindos was inhabited by races from Thrace, Mygdonia and Ionia. Sindians were cultivators, farmers, fishermen and many of them collected gold from Ehedoros river. The territory was rich in gold and we have several remainings from that era to confirm it. An ancient graveyard was recovered in Sindos by the known professor Tiverius and what is known as the Double Altar of Aghialos (shells with names and other objects have been found there). The remains have shown clues that the Sindians were in communication with the islands of Chios and Samos and were in trading relationships with Evia, Thessalia, Korinthos and the islands of the Aegean open sea. Sindos nowadays is a highly developed industrial community.