Penelope Knatchbull, Countess Mountbatten of Burma

Born in London, she is the only daughter of Reginald Eastwood (1912–1980), founder of Angus Steakhouse, and Marian Hood (1926–2020).

Penelope Meredith Mary Knatchbull, Countess Mountbatten of Burma (née Eastwood; born 16 April 1953), known between 1979 and 2005 as Lady Romsey and between 2005 and 2017 as the Lady Brabourne, is a British aristocrat and the wife of Norton Knatchbull, 3rd Earl Mountbatten of Burma.

She had one younger brother, Peter Eastwood (1955–2013).

She grew up and was educated in Switzerland.

In 1976, she graduated from the London School of Economics.

On 20 October 1979 at Romsey Abbey, she married Lord Romsey, son and heir of the 2nd Countess Mountbatten of Burma and the 7th Lord Brabourne.

The groom's second cousin, Charles, Prince of Wales (later King Charles III), served as best man.

The wedding took place two months after the assassination of her husband's grandfather, the 1st Earl Mountbatten of Burma, by an IRA bomb.

The family seat is Broadlands, Hampshire.

Lady Mountbatten and her husband have three children and three grandchildren:

Lady Mountbatten is portrayed by Natascha McElhone in the fifth season of the Netflix series The Crown.

She was particularly close to Prince Philip, Duke of Edinburgh from the 1990s when they participated in carriage driving competitions.

She was one of only 30 mourners at his funeral on 17 April 2021 at St George's Chapel, Windsor Castle.

Since 2010, she has served as High Steward of Romsey.

In 2010, she succeeded her husband in the honorary position of High Steward of Romsey after he stepped down due to illness.

The position had previously been filled by the 1st Earl Mountbatten of Burma.

Following the death of her daughter, she founded Leonora Children's Cancer Fund which in 2010 merged with The Edwina Mountbatten Trust, founded in memory of Leonora's great-grandmother.

She was inaugurated on 2 March 2011.

The merged charities were renamed The Edwina Mountbatten and Leonora Children's Foundation on 20 February 2014.

She has taken on the running of Broadlands following her husband's diagnosis with Alzheimer's disease.

Since her marriage, Lady Mountbatten has been in close contact with the British royal family.

She frequently attends the Royal Windsor Horse Show as a guest of the royal family.

At her daughter's wedding in 2016, King Charles III, then Prince of Wales, gave the bride away.

With her daughter Lady Alexandra Hooper, Lady Mountbatten attended the state funeral of Queen Elizabeth II on 19 September 2022.