Prince Williamhas been preparing to become king for most of his life.

The Duke of Cambridge is currently second in line to the throne behind his father, Prince Charles.

However, he’s been taking pointers from his grandmother, Queen Elizabeth, since he was a child.

Kate Middleton smiles for a photo.

It was William’s constitutional education," he said.

When William eventually ascends to the throne he will be known as King William.

This will also make his wife,Kate Middletonthe queen consort (viaTown & Country).

Prince William and Kate Middleton at an event.

Kate’s official title is expected to become Queen Catherine as she supports her husband in his royal duties.

Kate’s own royal duties will include attending engagements and traveling for foreign visits.

She will also be the face of many campaigns and charity organizations.

However, her role will remain non-political.

Kate will likely be crowned alongside William in a similar, but more simple ceremony when the time comes.

The title of Princess of Wales was previously held by Charles’s late ex-wife, Diana.

“It’s hard to see it not happening,” a source told The Telegraph (viaExpress).

“I’m sure it’ll be a bit of a bittersweet moment.