They had tried to civilise some ruffian squabbling Greek city states. But got a bloody nose at Plataea.
λέγεται δὲ καὶ τάδε γενέσθαι, ὡς Ξέρξης φεύγων ἐκ τῆς Ἑλλάδος Μαρδονίῳ τὴν κατασκευὴν καταλίποι τὴν ἑωυτοῦ· Παυσανίην ὦν ὁρῶντα τὴν Μαρδονίου κατασκευὴν χρυσῷ τε καὶ ἀργύρῳ καὶ παραπετάσμασι ποικίλοισι κατεσκευασμένην, κελεῦσαι τούς τε ἀρτοκόπους καὶ τοὺς ὀψοποιοὺς κατὰ ταὐτὰ καθὼς Μαρδονίῳ δεῖπνον παρασκευάζειν.
This other story is also told. When Xerxes fled from Hellas, he left to Mardonius his own establishment. Pausanias, seeing Mardonius' establishment with its display of gold and silver and gaily colored tapestry, ordered the bakers and the cooks to prepare a dinner such as they were accustomed to do for Mardonius.
9.82.2 ὡς δὲ κελευόμενοι οὗτοι ἐποίευν ταῦτα, ἐνθαῦτα τὸν Παυσανίην ἰδόντα κλίνας τε χρυσέας καὶ ἀργυρέας εὖ ἐστρωμένας καὶ τραπέζας τε χρυσέας καὶ ἀργυρέας καὶ παρασκευὴν μεγαλοπρεπέα τοῦ δείπνου, ἐκπλαγέντα τὰ προκείμενα ἀγαθὰ κελεῦσαι ἐπὶ γέλωτι τοὺς ἑωυτοῦ διηκόνους παρασκευάσαι Λακωνικὸν δεῖπνον.
They did his bidding, but Pausanias, when he saw golden and silver couches richly covered, and tables of gold and silver, and all the magnificent service of the banquet, was amazed at the splendor before him, and for a joke commanded his own servants to prepare a dinner in Laconian fashion. When that meal, so different from the other, was ready, Pausanias burst out laughing and sent for the generals of the Greeks.
9.82.3 ὡς δὲ τῆς θοίνης ποιηθείσης ἦν πολλὸν τὸ μέσον, τὸν Παυσανίην γελάσαντα μεταπέμψασθαι τῶν Ἑλλήνων τοὺς στρατηγούς, συνελθόντων δὲ τούτων εἰπεῖν τὸν Παυσανίην, δεικνύντα ἐς ἑκατέρην τοῦ δείπνου παρασκευήν· ἄνδρες Ἕλληνες, τῶνδε εἵνεκα ἐγὼ ὑμέας συνήγαγον, βουλόμενος ὑμῖν τοῦδε τοῦ Μήδων ἡγεμόνος τὴν ἀφροσύνην δέξαι, ὃς τοιήνδε δίαιταν ἔχων ἦλθε ἐς ἡμέας οὕτω ὀϊζυρὴν ἔχοντας ἀπαιρησόμενος. ταῦτα μὲν Παυσανίην λέγεται εἰπεῖν πρὸς τοὺς στρατηγοὺς τῶν Ἑλλήνων. 9.82.3
When these had assembled, Pausanias pointed to the manner in which each dinner was served and said: Men of Hellas, I have brought you here because I desired to show you the foolishness of the leader of the Medes who, with such provisions for life as you see, came here to take away from us our possessions which are so pitiful. In this way, it is said, Pausanias spoke to the generals of the Greeks.