Britain is an island on which England, Wales and Scotland are on. Edward I was King of England. He invaded both Wales and Scotland, so he invaded other parts of Britain, but it would be incorrect to say he invaded Britain, as he was from England and was England's King, succeeding his father, Henry III.
The English King Edward III was also King of Wales, and he was king in 1364.
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Because he wanted to be King.
King Edward I,
Edward VII was the king of britain in 1907
Prince Edward, Prince of Wales Know as Edward of Woodstock or The Black Prince, Died before his Father King Edward III, the first Prince of Wales to die before becoming king, His son King Richard II became king on the death of Edward III.
Edward of Caernarvon, who later became King Edward II
Albert Edward, Prince of Wales (1841 - 1910) Later King Edward Vll
The future King Edward II
Prince Charles has the title of 'Prince of Wales' because of it being traditionally granted to the heir apparent to the reigning monarch of the United Kingdom of Great Britain and Northern Ireland. Originally it was granted to the future King Edward II as an infant in 1301 by his father King Edward I who had defeated the native princes of Wales and named his son as such as a matter of humiliation for the Welsh, incidentally Edward II was born in Wales, at Caernarfon. Edward II himself did not grant the title to his own son, Edward III who revived the tradition that has endured to the present day. It is almost certain that should Prince Charles accede to the throne of the United Kingdom of Great Britain and Northern Ireland, then Prince William would receive the title 'Prince of Wales'.
Edward V11 as in ''Edward and Mrs Simpson'' I believe it was during the second world war. Churchill and the ruling class of Britain wanted him out of way somewhere beyond the clutches of Hitler, who they feared might use the ex- king as a Nazi puppet, should the Germans ever invade Britain.
He tried to get more land so he attempted to take over Wales. The Welsh King stood up for his country, as did his son, but they were captured. Edward I decided to give his eldest son the title of Prince of Wales so no Welsh prince could become King. This tradition is still running.