The architect Bathykles from the Ionian Magnesia on Maiandros was invited in Sparta to create the throne that framed the 14 metre high cult statue in the middle of the 6th century B.C. In that period, Sparta had won the confrontation with Argos and, afterwards, founded the Peloponnesian Alliance. In the second monumental phase of the Sanctuary belongs the construction of the circular stepped altar.
A new, more precise representation of the circular gradual altar, through the design of only 5 building blocks, has been presented by Manolis Korres. During the restoration works that were carried out in the summer of 2009, the partial restoration of this monument could be carried through and also have its size confirmed which amounts to 8 metres in diameter and 4 metres in height. This effort can henceforth be enriched with new architectural pieces, as many of these pieces were preserved in the walls of Byzantine and post byzantine churches. It is therefore obvious that a partial in-situ restoration of the monuments on this area has now been rendered possible. Finally, it remains to be clarified if the information mentioned by Tsountas on the precise place of the monument can actually be confirmed.