Canadian Heraldic Authority in the context of "Coat of arms of Canada"

Rideau Hall (officially Government House) is the official residence of the governor general of Canada, the representative of the monarch of Canada. Located in Ottawa, the capital of the country, on a 36-hectare (88-acre) estate at 1 Sussex Drive, the main building consists of approximately 175 rooms across 9,500 square metres (102,000 sq ft), and 27 outbuildings around the grounds. Rideau Hall's site lies just outside the centre of Ottawa. It is one of two official vice-regal residences maintained by the federal Crown, the other being the Citadelle of Quebec. It is also used as the official residence of the monarch of Canada, when he is in Canada.

Most of Rideau Hall is used for state affairs, only 500 square metres (5,400 sq ft) of its area being dedicated to private living quarters, while additional areas serve as the offices of the Canadian Heraldic Authority and the principal workplace of the governor general and their staff; either the term Rideau Hall, as a metonym, or the formal idiom Government House is employed to refer to this bureaucratic branch. Officially received at the palace are foreign heads of state, both incoming and outgoing ambassadors and high commissioners to Canada, and Canadian Crown ministers for audiences with either the viceroy or the sovereign, should the latter be in residence. Rideau Hall is likewise the location of many Canadian award presentations and investitures, where prime ministers and other members of the federal Cabinet are sworn in, and where federal writs of election are "dropped", among other ceremonial and constitutional functions.

In heraldry, an escutcheon (/ɪˈskʌtʃən/, ih-SKUTCH-ən) is a shield that forms the main or focal element in an achievement of arms. The word can be used in two related senses. In the first sense, an escutcheon is the shield upon which a coat of arms is displayed. In the second sense, an escutcheon can itself be a charge within a coat of arms.

Escutcheon shapes are derived from actual shields that were used by knights in combat, and thus are varied and developed by region and by era. Since shields have been regarded as military equipment appropriate for men only, British ladies customarily bear their arms upon a lozenge, or diamond-shape, while clergymen and ladies in continental Europe bear their arms upon a cartouche, or oval. Other shapes are also in use, such as the roundel commonly used for arms granted to Aboriginal Canadians by the Canadian Heraldic Authority, or the Nguni shield used in African heraldry (likewise, Christian organisations and Masonic bodies tend to use the same shape, also known as a vesica piscis).