Mycenaean period The building of a Megaron in around 1500 BC is noted as genesis of the sanctuary. According to the Homeric hymn to Demeter, this was the first temple built by the Eleusinians in honour of the goddess. The megaron was renovated and extended in the Late Helladic period and was surrounded by strong enclosure wall with two gateways one to the north for the road to add them and one to the south towards the sea.