William's wife, the former Kate Middleton, visited the archaeological site as a child when her father worked for British Airways and the family lived in Jordan for close to three years in the 1980s.
The 36-year-old William was accompanied by Crown Prince Hussein, 23, with whom he watched England's World Cup match against Panama at his host's residence late on Sunday. "William said, "[Kate] is very sorry she can not be here with me so soon after the birth of our son Louis [on April 23], but her family remembers very fondly the nearly three years she spent here as a child when her father worked for British Airways in Amman".
The Duke of Cambridge posed for a photo on June 25 at the exact same spot amid the ancient Roman ruins in Jerash where his wife, Duchess Kate, was photographed playing at age 4 with sister Pippa Middleton and dad Michael Middleton more than three decades ago.
She went to an English language nursery while her parents were in the country for nearly three years, before they returned to Berkshire in 1986.
Samia Khouri, director of museums at Jordan's Department of Antiquities, guided the two princes around the site during a half-hour tour. I must say that this is not exactly true because there is a representative here, and this is his great-grandmother, Princess Alice, one of the Righteous Among the Nations who saved Jews in Greece during World War II and asked to be buried here in Jerusalem. He did not expect that.
William then stood in the same spot where the photo was taken.
The children greeted the two princes in the amphitheater of Jerash, where they showed him some of their art work, including paintings.
The Duke of Cambridge arrives at Israel Ben Gurion Airport in Tel Aviv, Israel.
British royals have historically declined invitations for official state visits to Israel.
Prince William will continue his "non-political" trip of the Middle East, through Jordan, Israel and Palestine, before heading to the Dar Na'mah Centre.
He will stay with his entourage, including Foreign Office officials, at the five-star King David Hotel in Jerusalem.
But it kind of explains the hard political tightrope on which the Duke of Cambridge - and his team - must walk over the next few days.