Deiwos

Dyēus (also *Dyḗus Ph₂tḗr , alternatively spelled dyēws) is believed to have been the chief deity in the religious traditions of the prehistoric Proto-Indo-European societies. Part of a larger pantheon, he was the god of the daylit sky, and his position may have mirrored the position of the patriarch or monarch in society. In his aspect as a father god, his consort would have been Pltwih₂ Méh₂ter, "earth mother".

This deity is not directly attested; rather, scholars have reconstructed this deity from the languages and cultures of later Indo-European peoples such as the Greeks, Latins, and Indo-Aryans. According to this scholarly reconstruction, Dyeus was addressed as Dyeu Ph₂ter, literally "sky father" or "shining father", as reflected in Latin Iūpiter, Diēspiter, possibly Dis Pater and deus pater, Greek Zeu pater, Sanskrit Dyàuṣpítaḥ. As the pantheons of the individual mythologies related to the Proto-Indo-European religion evolved, attributes of Dyeus seem to have been redistributed to other deities. In Greek and Roman mythology, Dyeus remained the chief god; however, in Vedic mythology, the etymological continuant of Dyeus became a very abstract god, and his original attributes and dominance over other gods appear to have been transferred to gods such as Agni or Indra.

Rooted in the related but distinct Indo-European word *deiwos is the Latin word for deity, deus. The Latin word is also continued in English divine, "deity", and the original Germanic word remains visible in "Tuesday" ("Day of Tīwaz") and Old Norse tívar, which may be continued in the toponym Tiveden ("Wood of the Gods", or of Týr).

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