Flag of Greece designs differ according to the historical era they were used in and in accordance with the political scene in Greece at the time. The first flag to be used by a head of state of Greece was that of King Otto of Greece. Following the establishment of the Kingdom of Greece in 1832, the 17-year old Bavarian prince Otto was selected as king for the newfound monarchy. A royal decree dated 4 (16) April 1833 prescribed a number of maritime flags, including the royal standard. This flag, set at a 7:10 ratio, was a variant of the Greek white-cross-on-blue and
Trooping the Colour and one weeks preceding the Queen's Birthday Parade respectively. The salute is taken, respectively, by the Major-General commanding the Household Division and the Colonel of the Regiment which is trooping its colour. On the day of Trooping the Colour, the Royal Standard is flown from Buckingham Palace and from Horse Guards Building, while the Union Flag (colloquially known as the Union Jack), is flown from public buildings as well as the flags of the British Commonwealth of Nations, especially in recent years. Participants and positioning: "Nos 1-6 Guards" - six companies of Foot Guards, each comprising 3 officers and 71