The religious element is difficult to identify in Mycenaean Greece (c. 1600-1100 BC), especially as regards archaeological sites, where it remains problematic to pick out a place of worship with certainty. John Chadwick points out that at least six centuries lie between the earliest presence of Proto-Greek speakers in Hellas and the earliest inscriptions in the Mycenaean script known as Linear B, during which concepts and practices will have fused with indigenous beliefs, and—if cultural influences in material culture reflect influences in religious beliefs—with Minoan religion. As for these texts, the few lists of offerings that give names of gods as recipients of goods reveal nothing about religious practices, and there is no surviving literature. John Chadwick rejected a confusion of Minoan and Mycenaean religion derived from archaeological correlations and cautioned against "the attempt to uncover the prehistory of classical Greek religion by conjecturing its origins and guessing the meaning of its myths" above all through treacherous etymologies.Moses I. Finley detected very few authentic Mycenaean reflections in the eighth-century Homeric world, in spite of its "Mycenaean" setting. However, Nilsson asserts, based not on uncertain etymologies but on religious elements and on the representations and general function of the gods, that a lot of Minoan gods and religious conceptions were fused in the Mycenaean religion. From the existing evidence, it appears that the Mycenaean religion was the mother of the Greek religion. The Mycenaean pantheon already included many divinities that can be found in classical Greece.
Poseidon (Po-se-da-o) seems to have occupied a place of privilege. He was a chthonic deity, connected with the earthquakes (E-ne-si-da-o-ne: earth shaker), but it seems that he also represented the river spirit of the underworld as it often happens in Northern European folklore. Also to be found are a collection of "Ladies". On a number of tablets from Pylos, we find Po-ti-ni-ja (Potnia, "lady" or "mistress") without any accompanying word. It seems that she had an important shrine at the site Pakijanes near Pylos. In an inscription at Knossos in Crete, we find the "mistress of the Labyrinth" (da-pu-ri-to-jo po-ti-ni-ja), who calls to mind the myth of the Minoan labyrinth. The title was applied to many goddesses. In a Linear B tablet found at Pylos, the "two queens and the king" (wa-na-ssoi, wa-na-ka-te) are mentioned, and John Chadwick relates these with the precursor goddesses of Demeter, Persephone and Poseidon.