Xenia (Greek)
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Xenia is an ancient Greek concept of hospitality. It is almost always translated as 'guest-friendship' or 'ritualized friendship'. It is an institutionalized relationship rooted in generosity, gift exchange, and reciprocity. Historically, hospitality towards foreigners and guests was understood as a moral obligation. Hospitality towards foreign Hellenes honored Zeus Xenios, patrons of foreigners.
Jupiter and Mercurius in the House of Philemon and Baucis (1630–33) by the workshop of Rubens: Zeus and Hermes, testing a village's practice of hospitality, were received only by Baucis and Philemon, who were rewarded while their neighbors were punished.
Abraham and the Three Angels (Byzantine mosaic, Monreale)
Seventh Letter
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The Seventh Letter of Plato is an epistle that tradition has ascribed to Plato. It is by far the longest of the epistles of Plato and gives an autobiographical account of his activities in Sicily as part of the intrigues between Dion and Dionysius of Syracuse for the tyranny of Syracuse. It also contains an extended philosophical interlude concerning the possibility of writing true philosophical works and the theory of forms. Assuming that the letter is authentic, it was written after Dion was assassinated by Calippus in 353 BC and before the latter was in turn overthrown a year later.
Dionysius I of Syracuse