Elizabeth II was Queen of Sierra Leone from 1961 to 1971, when Sierra Leone was an independent constitutional monarchy. She was also the monarch of other Commonwealth realms, including the United Kingdom. Her constitutional roles in Sierra Leone were mostly delegated to the governor-general of Sierra Leone.
Elizabeth II
The Queen on Sierra Leonean stamps of 1956
A Sierra Leonean medal bearing Queen Elizabeth II's effigy and an inscription on the obverse
Queen Elizabeth II had a variety of flags to represent her personally and as head of state of several independent nations around the world. They were usually used on any building, ship, car, or aircraft where she was present.
Princess Elizabeth's standard flying in the background, during her 1951 royal tour of Canada
The Royal Yacht Britannia flying the Royal Standard and the Flag of the Lord High Admiral, 1977
The Queen's Canadian Standard flying on her car, at the opening of the 1978 Commonwealth Games in Edmonton, Alberta
The Queen's Australian Standard being used by her at Brisbane, 1982