But, regardless of their philanthropic and charitable commitments, the Duchy of Cornwall is also an important heritage, from a financial point of view in particular, they will inherit one day of Prince Charles.
William and Kate met residents on the Tregunnel Hill housing estate in Newquay, developed on Duchy of Cornwall land in the last few years.
For her second day of engagements, Kate went casual (and oh-so-cute) in a Smythe jacket, a white top and pair of graphic printed trousers from Gap.
FYI: Kate is wearing a Lela Rose dress.
She accessorized with a chunky silver watch and dove-gray heels, while William was dapper in a grey checked blazer.
William and Kate were due to spend the day touring the Isles of Scilly’s main island, St Mary’s, meeting locals and learning about industries that support the local economy.
William and Kate were then treated to a performance by 16 year old Ellie Kiraly from Porthtowan, who sung Stay With Me by Sam Smith.
Prince William told a group of young people at a youth centre that it is “totally cool” for them to be unsure about what they want, while the Duchess admitted that she found it “difficult” herself.
The teenager was only told of the royal visit at 6pm the previous day and spent all night “tossing and turning” ahead of her performance.
Not one to miss a royal selfie opportunity (more on that later), the construction worked posed in front of the couple in clear view of Kate and William for his selfie.
The Duchess asked some the people benefiting from the programme “do any of you know what you would love to be?” adding “Do you have some aspirations?”
Kate Middleton may be a poised and elegant princess, but that doesn’t mean she can’t down a seriously strong shot of whiskey from time to time.
He said: “I managed to get them coming out and William turned to me and said “that is a bad selfie” which made Kate laugh”. They gained access to the fund on their 30th birthdays – thought by then to have been built up to £10m.
The islands are known for Scilly Flowers, a postal flower service which operates from St Martin’s and the royal couple will meet members of the family run business.