Question: De Beneficiis and the series regarding "the happy life" translate to what Greek concept?

Context paragraphs:
History of the concept of creativity: The ways in which societies have perceived the concept of creativity have changed throughout history, as has the term itself.  The ancient Greek concept of art (in Greek, ""techne"" — the root of "technique" and "technology"), with the exception of poetry, involved not freedom of action but subjection to "rules".  In Rome, the Greek concept was partly shaken, and visual artists were viewed as sharing, with poets, imagination and inspiration.

Elysium: Elysium or the Elysian Fields (Ancient Greek: Ἠλύσιον πεδίον , "Ēlýsion pedíon") is a conception of the afterlife that developed over time and was maintained by some Greek religious and philosophical sects and cults.  Initially separate from the realm of Hades, admission was reserved for mortals related to the gods and other heroes.  Later, it expanded to include those chosen by the gods, the righteous, and the heroic, where they would remain after death, to live a blessed and happy life, and indulging in whatever employment they had enjoyed in life.

Constitutio de feudis: The Constitutio de feudis ("Constitution of Fiefs"), also known as the Edictum de beneficiis regni Italici ("Edict on the Benefices of the Italian Kingdom"), was a law regulating feudal contracts decreed by the Emperor Conrad II on 28 May 1037 (Pentecost Eve) at Pavia, during his siege of Milan.  It "had wider and more lasting effects on Italian society than any other piece of imperial legislation," and by "attract[ing] to the cities [the moderately-wealthy landowner, it] built a bridge at a high social level between city and countryside."  According to Susan Reynolds, it "mark[s] the foundation of the academic law of fiefs", as it formed the basis for the "Libri feudorum".

Xenia (Greek): Xenia (Greek: ξενία, "xenía" , trans.  "guest-friendship") is the ancient Greek concept of hospitality, the generosity and courtesy shown to those who are far from home and/or associates of the person bestowing guest-friendship.  The rituals of hospitality created and expressed a reciprocal relationship between guest and host expressed in both material benefits (such as the giving of gifts to each party) as well as non-material ones (such as protection, shelter, favors, or certain normative rights).

De Beneficiis: De Beneficiis is a first-century work by Seneca the Younger (c. 4 BC – 65 AD).  It forms part of a series of moral essays (or "Dialogues") composed by Seneca, whose other philosophical explorations included providence, steadfastness, the happy life, anger, leisure, tranquility, the brevity of life, gift-giving, forgiveness, and treatises on natural phenomena.

TV Belgiek: TV Belgiek is an editorial, animated series regarding the Belgian politics and royalty, produced by MagicWorlds.  The series treats contemporary issues not older than 1 week.  The episodes take about 2 to 3 minutes and can be viewed weekly on the website of TV Belgiek.

Happiness: In philosophy, happiness translates the Greek concept of "eudaimonia", and refers to the good life, or flourishing, rather than simply an emotion.

Horkos: In Greek mythology, the figure of Horkos (Greek: Ὅρκος , "oath") personifies the curse that will be inflicted on any person who swears a false oath.  In Aesop’s Fables there is a cautionary story, numbered 239 in the Perry Index, indicating that retribution is swift where the god is defied.  Oath-taking and the penalties for perjuring oneself played an important part in the Ancient Greek concept of justice.

The Short Happy Life of the Brown Oxford: "The Short Happy Life of the Brown Oxford" is a science fiction short story by Philip K. Dick, first published in the January, 1954 edition of "The Magazine of Fantasy & Science Fiction" and later in "Beyond Lies the Wub" in 1984 and in "The Short Happy Life of the Brown Oxford", a collection of Philip K. Dick short stories, in 1990.

Kathekon: Kathēkon (Greek: καθῆκον ) (plural: "kathēkonta" Greek: καθήκοντα ) is a Greek concept, forged by the founder of Stoicism, Zeno of Citium.  It may be translated as "appropriate behaviour", "befitting actions," or "convenient action for nature", or also "proper function."  "Kathekon" has been translated in Latin by Cicero as "officium", and by Seneca as "convenentia".  "Kathēkonta" are contrasted, in Stoic moral, with "katorthōma" (κατόρθωμα; plural: "katorthōmata"), roughly "perfect action."  According to Stoic philosophy, man (and all living beings) must act in accordance with Nature, which is the primary sense of "kathēkon".

Supporting paragraphs: De Beneficiis Happiness
Answer: eudaimonia