2011: IRELAND STATE VISIT
The queen's high-profile visit to Ireland is the first by a British monarch since the Republic of Ireland won independence in 1922.
An address in Irish, plus other symbolic gestures, helps galvanise reconciliation and cement the peace process in Northern Ireland, after years of conflict over British rule.
2012: OLYMPICS AND DIAMOND JUBILEE
The queen and other senior royals visit every region of Britain to mark her 60 years on the throne. Beacons are lit across the country, and a river pageant is held in London.
A surprise cameo for the monarch alongside James Bond actor Daniel Craig is a hit at the opening ceremony of the 2012 London Olympics.
2021: COVID, PHILIP, HEALTH FEARS
The coronavirus pandemic forces the ageing queen into self-isolation at Windsor, from where she makes public appearances over video conference.
Prince Philip dies aged 99 in April 2021, while later that year fears grow for the queen's own health after she spends a night in hospital and is forced to cut back her duties.