The Duke and Duchess of Cambridge were among the attendees at a ceremony marking the end of RAF Search and Rescue Force operations at RAF Valley after 75 years.
Prince William worked at the base as a search and rescue pilot between 2010 and 2013, during which time he and Kate lived quietly in the area.
The royal couple have always held Anglesey close to their hearts: as well as enjoying many years living there away from the limelight, it's where Kate chose to make her first public appearance following the birth of Prince George in 2013. They also donated £5,000 to a Welsh flood appeal the following year, recognising the love and support they'd enjoyed from the Welsh communities over the years.
In a speech delivered in Anglesey in August 2013, after finishing his final shift, Prince William had said: "I know that I speak for Catherine when I say that I have never in my life known somewhere as beautiful and as welcoming as Anglesey.
"I know that both of us will miss it terribly when my search and rescue tour of duty comes to an end next month and we have to move elsewhere. From the bottom of my heart, thank you for making my wife and me so welcome when we arrived here, as you do thousands of visitors each year."
He said Anglesey would always hold special memories as it was the couple's first home together, adding: "Catherine and I look forward to returning again and again over the coming years with our family."
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