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DUBLIN, IRELAND - MARCH 04: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a reception held by Irish Tanaiste (Deputy Prime Minister) Simon Coveney on March 4, 2020 in Dublin, Ireland. (Photo by Phil Noble - WPA Pool/Getty Images)

DUBLIN, IRELAND - MARCH 04: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a reception held by Irish Tanaiste (Deputy Prime Minister) Simon Coveney on March 4, 2020 in Dublin, Ireland. (Photo by Phil Noble - WPA Pool/Getty Images)

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DUBLIN, IRELAND - MARCH 04: A first edition copy of James Joyce's novel "Ulysses" is shown to Britain's Prince William, Duke of Cambridge and his wife Catherine, Duchess of Cambridge, as they attend a reception held by Irish Tanaiste (Deputy Prime Minister) Simon Coveney on March 4, 2020 in Dublin, Ireland. (Photo by Phil Noble - WPA Pool/Getty Images)

DUBLIN, IRELAND - MARCH 04: A first edition copy of James Joyce's novel "Ulysses" is shown to Britain's Prince William, Duke of Cambridge and his wife Catherine, Duchess of Cambridge, as they attend a reception held by Irish Tanaiste (Deputy Prime Minister) Simon Coveney on March 4, 2020 in Dublin, Ireland. (Photo by Phil Noble - WPA Pool/Getty Images)

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DUBLIN, IRELAND - MARCH 04: Prince William, Duke of Cambridge speaks as he and Catherine, Duchess of Cambridge, attend a reception held by Irish Tanaiste (Deputy Prime Minister) Simon Coveney on March 4, 2020 in Dublin, Ireland. (Photo by Phil Noble - WPA Pool/Getty Images)

DUBLIN, IRELAND - MARCH 04: Prince William, Duke of Cambridge speaks as he and Catherine, Duchess of Cambridge, attend a reception held by Irish Tanaiste (Deputy Prime Minister) Simon Coveney on March 4, 2020 in Dublin, Ireland. (Photo by Phil Noble - WPA Pool/Getty Images)

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DUBLIN, IRELAND - MARCH 04: Britain's Prince William, Duke of Cambridge and his wife Catherine, Duchess of Cambridge attend a reception held by Irish Tanaiste (Deputy Prime Minister) Simon Coveney on March 4, 2020 in Dublin, Ireland. (Photo by Phil Noble - WPA Pool/Getty Images)

DUBLIN, IRELAND - MARCH 04: Britain's Prince William, Duke of Cambridge and his wife Catherine, Duchess of Cambridge attend a reception held by Irish Tanaiste (Deputy Prime Minister) Simon Coveney on March 4, 2020 in Dublin, Ireland. (Photo by Phil Noble - WPA Pool/Getty Images)