The Etruscan thesauroi in the sanctuary of Apollo at Delphi,

After the battle of the Sardinian Sea (540-535 BC) Etruscan aristocrats of Caere consulted the Delphic oracle and to show their thanks built their own θησαυρός in the sanctuary of Apollo. The building needed a special decree, because only Greek cities could have their own θησαυροί in sanctuaries. The Etruscans of Caere needed to become Greeks. Thanks to the close relationship with the Greek world in the sixth century BC, legends and myth were developed in the sanctuary at Delphi and Greek origins were created for the Etruscans of Caere. We do not know the chronological duration of this building, which is unknown on the ground. The construction of the θησαυρός in the sanctuary of Apollo at Delphi is close to another important event in the history of Caere, The construction of a new temple in the sanctuary at Pyrgi was around 510 BC. It was solemnly dedicated with Etruscan and Punic inscriptions inscribed on gold tablets . The constructions of the θησαυρός in the sanctuary of Apollo at Caere and of the new temple at Pyrgi are surely connected and they show the important role the Etruscans of Caere were playing in the Mediterranean. In the second quarter of the fifth cent. BC a similar action was undertaken in the sanctuary of Apollo for the Etruscans of Spina, which become also a πόλις Ἑλληνίς. This building is also unknown on the ground, but a votive offering may be assigned to an Etruscan of the Po Valley, the rests of a folding stool, a seat used in Etruria by magistrates.