Question: What country does Royal Arms of England and House of Plantagenet have in common?

Context articles: Royal coat of arms of the United Kingdom
Royal Arms of Scotland
National coat of arms
Royal supporters of England
House of Plantagenet
Royal Arms of England
In My Defens God Me Defend
Ancient and modern arms
Cadency labels of the British royal family
List of coats of arms of the House of Plantagenet

The royal coat of arms of the United Kingdom, or the Royal Arms for short, is the official coat of arms of the British monarch, currently Queen Elizabeth II.
 These arms are used by the Queen in her official capacity as monarch of the United Kingdom.
 Variants of the Royal Arms are used by other members of the British royal family; and by the British government in connection with the administration and government of the country.
 In Scotland, there exists a separate version of the Royal Arms, a variant of which is used by the Scotland Office.
 The arms in banner form serve as basis for the monarch's official flag, known as the "Royal Standard".
The royal arms of Scotland was the official coat of arms of the King of Scots first adopted in the 12th century.
 With the Union of the Crowns in 1603, James VI inherited the thrones of England and Ireland and thus his arms in Scotland were now quartered with the arms of England (which was itself quartered with France) with an additional quarter for Ireland also added (the arms would continue to alter in later years).
 Though the kingdoms of England and Scotland would share the same monarch, the distinction in heraldry used in both kingdoms was maintained.
 When the kingdoms of Scotland and England were united under the Acts of Union 1707 to form the United Kingdom of Great Britain, no single arms were created and instead, the royal arms as used in either Scotland and the rest of the United Kingdom would continue to differ.
A national coat of arms is a symbol which denotes an independent state in the form of a heraldic achievement.
 While a national flag is usually used by the population at large and is flown outside and on ships, a national coat of arms is normally considered a symbol of the government or (especially in monarchies) the head of state personally and tends to be used in print, on heraldic china, and as a wall decoration in official buildings.
 The royal arms of a monarchy, which may be identical to the national arms, are sometimes described as arms of dominion or arms of sovereignty.
The royal supporters of England refer to the heraldic supporter creatures appearing on each side of the royal arms of England.
 The royal supporters of the monarchs of England displayed a variety, or even a menagerie, of real and imaginary heraldic beasts, either side of their royal arms of sovereignty, including lion, leopard, panther and tiger, antelope and hart, greyhound, boar and bull, falcon, cock, eagle and swan, red and gold dragons, as well as the current unicorn.
The House of Plantagenet ( ) was a royal house which originated from the lands of Anjou in France.
 The name Plantagenet is used by modern historians to identify four distinct royal houses – the Angevins who were also Counts of Anjou, the main body of the Plantagenets following the loss of Anjou, and the houses of Lancaster and York, the Plantagenets' two cadet branches.
 The family held the English throne from 1154, with the accession of Henry II, until 1485, when Richard III died.
The Royal Arms of England are the armorials (or coat of arms) first adopted in a fixed form at the start of the age of heraldry (circa 1200) as personal arms by the Plantagenet kings who ruled England from 1154.
 In the popular mind they have come to symbolise the nation of England, although according to heraldic usage nations do not bear arms, only persons and corporations do.
 The blazon of the Arms of Plantagenet is: "Gules, three lions passant guardant in pale or armed and langued azure", signifying three identical gold lions (also known as leopards) with blue tongues and claws, walking past but facing the observer, arranged in a column on a red background.
 Although the tincture "azure" of tongue and claws is not cited in many blazons, they are historically a distinguishing feature of the Arms of England.
 This coat, designed in the High Middle Ages, has been variously combined with those of the Kings of France, Scotland, a symbol of Ireland, the House of Nassau and the Kingdom of Hanover, according to dynastic and other political changes occurring in England, but has not altered since it took a fixed form in the reign of Richard I (1189–1199), the second Plantagenet king.
In my defens God me defend is the motto of both the Royal coat of arms of the Kingdom of Scotland and Royal coat of arms of the United Kingdom used in Scotland.
 Contemporary versions of the Royal arms show an abbreviated motto, in the form of "IN DEFENS" or, where English is used as an alternative, "IN DEFENCE".
 The motto appears above the crest of the arms, in the tradition of Scottish heraldry.
Ancient and modern are terms used in heraldry to differentiate two different coats of arms used at different periods by a family or other bearer.
 Reasons for changing arms have been numerous, the most famous being the change in the French royal arms to show three fleurs-de-lis instead of "semee de lis", possibly to symbolize the Holy Trinity.
 The reasons for other changes were more prosaic, for example where a court of chivalry ordered a change or differencing where two families claimed the same arms, as in the famous case of Scrope v Grosvenor.
 The resulting two versions of arms are referred to as "France ancient" and "France modern", "Grosvenor ancient" and "Grosvenor modern".
Heraldic labels are used to differentiate the personal coats of arms of members of the royal family of the United Kingdom from that of the monarch and from each other.
 In the Gallo-British heraldic tradition, cadency marks have been available to "difference" the arms of a son from those of his father, and the arms of brothers from each other, and traditionally this was often done when it was considered important for each man to have a distinctive individual coat of arms and/or to differentiate the arms of the head of a house from junior members of the family.
 This was especially important in the case of arms of sovereignty: to use the undifferenced arms of a kingdom is to assert a claim to the throne.
 Therefore, in the English royal family, cadency marks were used from the time of Henry III, typically a label or bordure alluding to the arms of the bearer's mother or wife.
 After about 1340, when Edward III made a claim to the throne of France, a blue label did not contrast sufficiently with the blue field of the French quarter of the royal arms; accordingly most royal cadets used labels argent: that of the heir apparent was plain, and all others were charged.
 Bordures of various tinctures continued to be used into the 15th century.
The House of Plantagenet was the first truly armigerous royal dynasty of England.
 The arms of this noble, later royal, family, "Gules, three lions passant guardant or (armed and langued azure)", termed colloquially "the arms of England" signifying the "arms of the royal house of England", were first adopted by King Richard the Lionheart (1189–1199), son of King Henry II of England (1154–1189), son of Geoffrey Plantagenet, Count of Anjou (1113/17–1151).
 The various cadet branches descended from this family bore differenced versions of the arms of England.