He'll be King William V. William IV was the predecessor of Victoria and the son of George III.
That is unless he chooses to change his name, which is quite common in the royal family.
Prince Charles is currently first in line. It is unlikely that he will take the position, due to his age, so it's more likely that his son, Prince William, will be next.
William the Silent (also called William of Orange, but not the English king of that name) was called "the Silent" because he had a legendary ability to keep his opinion to himself. There is a link below for more information.
If you are referring to the United Kingdom, Prince William will probably become William V when he is king.
King William 111, Prince of Orange 1688-1704
When Charles passes, Prince William will become King. Prince William is the next in line afer Charles. However, Queen Elizabeth is currently still on the throne.
the dutchess of cambrige
The reason why Prince William isn't in Afghanistan is because he is next in line to be king after Charles becomes king.
If Prince William is alive after the death of his Grandmother Queen Elizabeth II and his Father Prince Charles he will become King.
Yes she will. When William becomes King the woman he is married to will be Queen.
Prince William is next in line of succession.
When the queen dies or retires princes charles will have the decision to become king or pass it down to william. And if charles becomes king then if he dies or retires william will be king
King William's horse was called "Sorrel".
Prince Phillip is not King because it was his wife who was the rightful heir to the throne and not him. The last consort of the rightful heir to the throne of the United Kingdom to become King in his own right was William III who ruled jointly with his wife Mary II. It will be different when Prince William becomes King. As his wife Kate Middleton will be Queen Consort.
More than likely she will be Queen Cathrine
No Prince William is not The Prince of Wales. That title is held by the eldest son of the reigning monarch. The reigning monarch is Queen Elizabeth II and her eldest son is Prince Charles, who is Prince of Wales. Prince William is known as Prince William of Wales because his father is Prince Charles. When Charles becomes King, then Prince William will become the Prince of Wales
If prince William does not accept then either his son will be king or there will not be any king
Prince William is now the Duke of Cambridge. He will not become the Prince of Wales until his father Prince Charles, the current Prince of Wales, becomes King. Even then, the title of Prince of Wales does not begin automatically. Prince William must have an investiture which bestows the title of Prince of Wales upon him. This answer was re-written by DieselEstate on 20th April 2012