Xenia (Greek: ξενία) is an ancient Greek concept of hospitality. It is almost always translated as 'guest-friendship' or 'ritualized friendship'.[1] It is an institutionalized relationship rooted in generosity, gift exchange, and reciprocity.[2] Historically, hospitality towards foreigners and guests (Hellenes not of your polis) was understood as a moral obligation, as well as a political imperative.[1][3] Hospitality towards foreign Hellenes honored Zeus Xenios (and Athene Xenia), patrons of foreigners.[4]
The rituals of hospitality created and expressed a reciprocal relationship between guest and host expressed in both material benefits (e.g. gifts, protection, shelter) as well as non-material ones (e.g. favors, certain normative rights).[4] The word is derived from xenos 'stranger'.