A Prince, usually. There isn't a special title they gain from being second in line to the throne, unlike the terms 'heir apparant' and 'heir presumptive'.
Prince
King
Solomon.
Your Great Uncle's son would be your 2nd cousin.
It is not known certainly but, an insciption call him a king's son. The king referred is unknown but he is thought to be the son of Amenhotep III or Akhenaten.
a prince wich is the kings son
Your 2nd cousin. He would be your mother's nephew.
Alexander the Great
King John, also known as John Lackland, Jean Sans Terre,was the fifth son of Henry II(Henri Court-mantel) and Eleanor of Aquitaine.
Henry vii was the 2nd Tudor king He had 2 daughters and 1 son unfortunately edward his son died at the age of 15
if the king's son refuses to be be king they pick the next in line after the king's son
The lady in waiting answered to king john the 2nd and his son athur.