Zeus the nominative is ("Zeús"). It is inflected as follows: vocative: (""); accusative: (); genitive: (); dative: (). Diogenes Laertius quotes Pherecydes of Syros as spelling the name, . "Zeus" is the Greek continuation of *"," the name of the Proto-Indo-European god of the daytime sky, also called *' ("Sky Father"). The god is known under this name in the Rigveda (Vedic Sanskrit "Dyaus/Dyaus Pita"), Latin (compare "Jupiter", from "Iuppiter", deriving from the Proto-Indo-European vocative *'), deriving from the root *"dyeu"- ("to shine", and in its many derivatives, "sky, heaven, god"). Zeus is the only deity in the Olympic pantheon whose
King of the Romans revived the title as King of Rome ("Roi de Rome"), styling his son as such at birth. The boy was often known colloquially by this title throughout his short life. However, from 1818 onward, he was styled officially as the Duke of Reichstadt by Emperor Francis I of Austria. This article uses material translated from the in the German-language Wikipedia, which, in turn, cites a source that contains further references: King of the Romans King of the Romans (; ) was a title used by Syagrius, then by the German king following his election by the princes from the time