The Duke of Cambridge's full title is His Royal Highness The Duke of Cambridge KG KT.

In his military life, The Duke is known as Flight Lieutenant William Wales.

Knight of the Garter (KG)
The Duke of Cambridge is a Knight of the Garter. The Most Noble Order of the Garter, founded by Edward III in 1348, is the senior British Order of Chivalry.

On St George's Day in 2008, The Queen announced that she had appointed Prince William to be a Royal Knight Companion of the Most Noble Order of the Garter.

The Order honours those who have held public office, who have contributed in a particular way to national life or who have served the Sovereign personally.

As the Patron Saint of the Order is St George (patron saint of soldiers and also of England), appointments are always announced on St George’s Day (23 April).

His Royal Highness became the 1000th Knight in the Register and was installed on 15 June 2008 at the Annual Garter Ceremony at Windsor Castle.

Counsellor of State
The Duke of Cambridge is a Counsellor of State, and was appointed to the position on his 21st birthday, replacing The Princess Royal.

Counsellors of State are members of the Royal Family who temporarily carry out some of the Sovereign's official duties in the absence of The Queen.

This situation may arise if The Queen is suffering from temporary illness or is absent abroad for more than a few days. She may delegate certain functions of the Sovereign in Britain, the dependencies, and other territories to her Counsellors of State. Commonwealth matters go straight to Her Majesty, wherever she may be.

Any two Counsellors of State may attend Privy Council meetings and they may sign routine documents. But their role is limited. For example, they cannot dissolve Parliament, except on The Queen's express instructions, nor create peers.

Counsellors of State are appointed from among the following: The Duke of Edinburgh and the four adults next in succession (provided they have reached the age of 21). These are currently The Prince of Wales, The Duke of Cambridge, Prince Harry and The Duke of York.

Knight of the Order of the Thistle (KT)
On 29 May 2012, The Duke of Cambridge said he was 'honoured' to be conferred to the Order of the Thistle in the year of The Queen's Diamond Jubilee.