The flag of Greece features nine equal horizontal stripes of blue alternating with white; there is a blue square in the upper hoist-side corner bearing a white cross; the cross symbolizes Greek Orthodoxy, the long-established religion of the country.
Greece Coat of Arms:
The national emblem features a blue escutcheon with a white cross totally surrounded by two laurel branches.
Flag of the Byzantine Empire
Athens Seal - Official Country Seal