The design of the Greek flag is adopted by the First National Assembly at Epidaurus.

The national flag of Greece, popularly referred to as the Blue-and-White or the Cyan-and-White, is officially recognised by Greece as one of its national symbols and has 5 equal horizontal stripes of blue alternating with white. There is a blue canton in the upper hoist-side corner bearing a white cross; the cross symbolises Eastern Orthodox Christianity. The blazon of the flag is azure, four bars argent; on a canton of the field a Greek cross throughout of the second. The official flag ratio is 2:3. The shade of blue used in the flag has varied throughout its history, from light blue to dark blue, the latter being increasingly used since the late 1960s. It was officially adopted by the First National Assembly at Epidaurus on 13 January 1822.

The First National Assembly of Epidaurus was the first meeting of the Greek National Assembly, a national representative political gathering of the Greek revolutionaries.