The King or Queen (who happens to be his parent and is the ruling monarch) dies.
Will not inherit the throne
King Duncan's eldest son, Malcolm, is supposed to inherit the throne after his father's death.
his son did not inherit the throne
that he wont be king but his descendants will be
Queen Mary I (Mary Tudor, Bloody Mary) did accede the throne when her brother, King Edward VI died.
There has not been a George VII in the UK but it is expected that Prince Charles will adopt that moniker when king.
King Edward of England thought he was the rightful heir of the French throne because he should inherit it. Another man claimed he should have the throne since Edward was already a king and one throne was enough for anyone. So a war broke out.
He was a king and not a dictator. The position of King was his by birthright and he was also considered placed on the throne by God. A dictator is a man who takes power from others. He doesn't inherit the throne, but takes it. The citizens of the country have no choice with a dictator, but with a king very few are overthrown and if they are it is by the people.
To inherit Duncan's Throne
The Prince of Wales.
The witches told Banquo that he would not be king himself, but his descendants would inherit the throne. They also warned him to be wary of Macbeth.
A king's throne is a ceremonial chair in which the king can sit.