Origin of aegis
The word aegis (protection) derives from the Latin ægis, which is a transliteration of the Greek Aigis, the shield of Zeus, related to aix (gen. aigos) "goat," as the shield was of goatskin.
Under the aegis of someone: under the auspices of someone, under the sponsorship or protection of someone or some group.
In modern Greek (Romeika):
a) aegida: aegis [αιγίδα]