In honor of The Duke of Cambridge’s upcoming 30th birthday, the Queen will make William a Knight of the Most Ancient and Most Noble Order of the Thistle; it is Scotland’s highest award of chivalry granted by the Queen, second only to the UK’s Order of the Garter.
It is unknown exactly when the Order came to be, however, legend dictates that it began in 809 when King Achaius made an alliance with the Emperor Charlemagne.
Facts about the Order as stated on the official website of the British Monarchy:
Motto: Nemo me impune lacessit (No one harms me with impunity)
Chapel: Thistle Chapel, St. Giles’ Cathedral
Ranks: Knight or Lady
Post-nominals: KT or LT