Flag of Greece At the flag's centre, the royal coat of arms of the new dynasty (Schleswig-Holstein-Sonderburg-Glücksburg) would feature. By a new royal decree of 3 June 1914, the distinguishing flags to be utilised by the various members of the royal family were described. The king's flag was defined as being square in shape and, as in previous flags, featured the coat of arms of the king on a Greek white-cross-on-blue. As the king at the time, Constantine I, was made a field marshal the previous year, the coat of arms on his flag featured a heraldic representation of the Marshal's baton in
Flag of Greece embassies and civil services, while the sea flag (without the crown) was allowed for use by private citizens. On 25 March 1924, with the establishment of the Second Hellenic Republic, the crowns were removed from all flags. On 20 February 1930, the national flag's proportions were established at a 2:3 ratio, with the arms of the cross being "one fifth of the flag's width". The land version of the national flag was to be used by ministries, embassies, and in general by all civil and military services, while the sea flag was to be used by naval and merchant vessels,