The Duke and Duchess of Cambridge – who spent many happy years living in Anglesey – flew by helicopter to Caernarfon, Gwynedd on Friday morning.
They left kids Prince George, two, and Princess Charlotte, six months, at home.
During their day in Wales, the royal couple will raise awareness about mental health issues by visiting art projects run by the Mind charity in Gwynedd and Denbigh. They met young students who used art as an expression of their mental health experiences and to raise awareness of the issues affecting young people today.
Kate and William will also visit the Mind Shed project and view its Peace Garden which has allotments run by a group of men aged from 30 to 93.
Additionally, they will meet pupils at an outdoor centre in Snowdonia.
Wales has always held special memories for the duke and duchess, who lived quietly in Anglesey from 2010 until the birth of Prince George in 2013.
It's where they spent their days as newlyweds and while Kate was pregnant with their first child. After his birth, they relocated to Kensington Palace in London, and Anmer House in Norfolk.
On a return visit to Anglesey just after George's birth, Wills had told the crowds: "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.
"This island has been our first home together, and will always be an immensely special place for us both. Catherine and I look forward to returning again and again over the coming years with our family."
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