The coat of arms of Portugal is the main heraldic insignia of Portugal. The present model was officially adopted on 30 June 1911, along with the present model of the Flag of Portugal. It is based on the coat of arms used by the Kingdom of Portugal since the Middle Ages. The coat of arms of Portugal is popularly referred as the Quinas (a quina being a group of five things).
The present model of the coat of arms of Portugal was designed by the painter Columbano, member of the commission appointed on the 15 October 1910 to present the project for a new National Flag, following the establishing of the Portuguese republic on the 5 October 1910. The models chosen by the commission were approved by the Provisional Government of the Republic on the 29 November 1910, confirmed by the Constituent Assembly through the decree of 19 June 1911, with its details being specified in the Diário do Governo (official journal) no 150 of 30 June 1911.
Three versions of the coat of arms were established, intended for different types of use. All three include, as its central element, the shield of the traditional Portuguese arms placed over a golden armillary sphere.
The basic version consists of only the Portuguese shield over the armillary sphere. This version was intended to be used on the National Flag and on the naval jack. From the 23 September 1911, this version was also used on the naval distinctive flags of the President of the Republic, ministers and other state authorities, latter being also used on some governmental and state flags created afterwards. Occasionally, this version is unofficially referred as the "lesser arms of Portugal".
The second version consists of the Portuguese shield over the armillary sphere, with this being surrounded by two branches of laurel, tied in the base with a white scroll with the Camões verse Esta é a ditosa Pátria minha amada ("This is my beloved merry homeland"). This version was intended to be used on the regimental colors of the military units.
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Le drapeau du Portugal (en portugais bandeira de Portugal) est actuellement de couleurs verte et rouge sur la séparation desquelles se trouvent une sphère armillaire et les armoiries du pays. Le drapeau actuel est le drapeau républicain qui a succédé en 1911 à l'ancien drapeau bleu et blanc. C'est un des nombreux drapeaux au dessin décentré vers la hampe. 300px|right|thumb| Description du drapeau. Le drapeau du Portugal se compose d'un rectangle de proportions 2:3, divisé verticalement en vert (sur les 2/5 de la longueur) et rouge (sur les 3/5).
La maison d'Aviz ou « dynastie jeanine » est une branche cadette de la maison de Bourgogne qui règne sur le royaume de Portugal de 1385 à 1580. Lors de la crise portugaise de 1383-1385, Jean, grand-maître de l'Ordre militaire d'Aviz et fils du roi Pierre , détrône sa nièce Béatrice et s'empare du pouvoir. Sa lignée mâle s'éteint en 1580, et au terme d'une nouvelle crise de succession, le trône passe par les femmes aux Habsbourg d'Espagne en la personne de Philippe II, le fils de Charles Quint.