Prince William supports the Queen at the Order of the Thistle cermony

The Queen led the British royals at the Knights of the Thistle ceremony in Edinburgh on Thursday.

Supported by her grandson Prince William, daughter Princess Anne and husband Prince Philip, Britain”s monarch took part in the age-old service at St Giles” Cathedral.

Starting the procession from the Scottish capital”s Signet Library, the Queen, Anne, William and Philip made their way along the Royal Mile, which was lined with well-wishers.

A majestic fanfare and a mounted guard of honour greeted the royals as they entered the cathedral while the band of the Royal Regiment of Scotland played in West Parliament Square.

Thursday”s ceremony saw Glasgow 2014 Commonwealth Games chairman Lord Smith of Kelvin and the Earl of Home instilled as Knights of the Thistle, Scotland”s highest national honour.

The Order of the Thistle, an award bestowed on men and women who have held public office or made a significant contribution to national life, is second in precedence to the UK”s Order of the Garter.

Princess Anne was invested in the Order of the Thistle in June 2001 while Prince William, who holds the title of the Earl of Strathearn in Scotland, was installed in 2012.