Prince Harry will hold a charity fundraising polo match in Singapore on Monday in aid of children in Africa living with HIV and Aids.
Harry, who is on a five-day visit to Singapore and Sydney, will take to the field for the Sentebale Polo Cup in support of his charity of the same name.
The event has become an important annual fundraising event for Sentebale, an organisation which works with children in Lesotho and Botswana who are coming to terms with being HIV positive, have Aids or have lost their parents to the disease.
The prince began his visit to Singapore on Sunday when he joined a Muslim community breaking its daily Ramadan fast, who paid their respects to the seven people killed during the terrorist attack in London.
The polo event, being held at the Singapore polo club, usually features international professional players and talented amateurs.
Cathy Ferrier, Sentebale's chief executive officer, said: "Since Sentebale was founded in 2006, the charity has reached thousands of children and young people in Lesotho, and latterly in Botswana, who have been struggling to come to terms with living with HIV by addressing their mental health and wellbeing.
"It is our ambition to see a reduction in the number of new HIV infections and Aids-related deaths amongst adolescents in southern Africa, by putting youth first and equipping them with skills and relevant wraparound support that they need to lead healthy, productive lives."
A 2004 gap year trip to the landlocked African nation of Lesotho inspired the prince to set up his charity two years later with the country's Prince Seeiso, younger brother of King Letsie III.
Their aim was to help youngsters in need and other children who had lost one or both parents to Aids or contracted the disease themselves.
In November 2015 Sentebale opened its £2 million Mamohato Children's Centre in Lesotho to scale up its Mamohato camps, a residential project providing psychological, social and practical support to children struggling to cope with being HIV positive.
In Sydney on Wednesday the prince will attend events to celebrate the city's hosting of the 2018 Invictus Games, the international sporting competition for wounded, injured and sick service personnel and veterans founded by the prince in 2014.