At the Bourtzi site of Tzannata Poros, between 1991-1993, the largest Mycenaean vaulted tomb of north-western Greece was discovered by archaeologist Lazaros Kolonas. Other Mycenaean tombs on the island had previously been revealed in Mazarakata and Lakithra of Livathos as well as in Paliki. The particularly long and covered mouth of this tomb is 3.35m long, 1m wide. and height 1.90m. while the tomb has a diameter of 6.80m, a preserved height of 3.95m. and is structured in the place of an older and smaller one, which had collapsed around 1350 BC. It is estimated that between 1400 and 1000 BC. in this grave there were hundreds of burials, apparently reigns, as the funeral gifts show.

It is clear that the tomb was taken from antiquity, but the remains of the remains seem to have been in use from the Mycenaeans to the Hellenistic times. The top of the dome collapsed during the Venetian occupation as it was discovered, as the tomb was then used as accommodation. The dead were placed in built-in cases at great depth. Near the vaulted tomb there is another one with pebbled floor that served as a bumper. There were found bones of 72 people who were transported there when the old vaulted tomb was replaced by the newest.

The dating and the kind of archaeological finds of the tomb, combined with the discovery in 2011 of the monumental building of the late Mycenaean period (1400-1200 BC) by archaeologist Antonios Vassilakis very close to the vaulted tomb, shows that there was an important Mycenaean center, which is very likely to be associated with Homer’s Ithaca.

Besides, we should not forget that the existence of human activity from the Neolithic Neolithic (mid-6th millennium) to the Early Bronze Age (in the 3rd millennium BC) has been demonstrated in the area, due to the findings in the Cave of Draskospilia located in the small gorge at the entrance of Poros. Indeed, this cave appears to have been re-used from the end of the 7th century to the Sanctuary of the Nymphs and the god Panas.