Britain’s Queen Elizabeth witnessed a military ceremony to mark her official birthday on Saturday.
Usual large parade of soldiers through London was cancelled due to the coronavirus pandemic.
A video of the ceremony was released on the Royal Family Twitter account.
It was the queen’s first official public appearance since the country went into lockdown in late March.
The 94-year-old queen watched a series of drills by the 1st Battalion Welsh Guards in the castle’s quadrangle, instead of the Trooping the Colour event that traditionally marks the occasion.
The queen, who has been living with her 99-year-old husband Prince Philip at the castle west of London, has issued a number of rallying messages to the nation in the past three months, including televised addresses that have been a rarity during her 68-year reign.