A spokesman for Kensington Palace declined to comment.The Prince was attending the reception as the guest of honour, and also presented Duke of Edinburgh Gold Awards to young people who had achieved them.In 2008, when Castro decided to stand down as president, Mr Gonsalves paid tribute to him by saying: “Cuba has made tremendous progress in the fields of agriculture, education and health … living standards.”In the United Nations Human Development Index it is ranked in the top 50.” Fidel Castro was a defining figure of the 20th century Show more When he closed the twice-a-decade congress of the Cuban Communist Party in April, he called on his countrymen to maintain socialist ideals in the face of closer ties with the US.Foreign Secretary Boris Johnson said: “Fidel Castro’s death marks the end of an era for Cuba and the start of a new one for Cuba’s people.”Mr Castro’s last appearance in public was at a gala to mark his birthday, which celebrated key moments in his life including repelling the US-backed attempt to invade in the Bay of Pigs in 1961. Prince Harry observed a moment’s silence for Fidel Castro as he attended a drinks reception in the Caribbean island of St Vincent.The Prince was put in the potentially awkward position on Saturday night by the Governor General of St Vincent, Sir Frederick Ballantyne, who is the Queen’s representative in the Commonwealth realm.Sir Frederick asked guests at the reception, jointly hosted by himself and the country’s Prime Minister, to observe a moment’s silence on the day the Communist dictator died aged 90.Ralph Gonsalves, the Prime Minister of St Vincent and the Grenadines, said: “Castro was a good friend of the island.”He said Castro had invested in St Vincent, which had been a trading partner of Cuba for decades. In his address, Cuban President Raul Castro said his brother died at 10.29pm on Friday and would be cremated on Saturday before a period of national mourning is observed.He ended the announcement by shouting the revolutionary slogan: “Toward victory, always!”The news was followed by jubilant scenes in Miami’s Little Havana, home to thousands of Cuban emigres who fled in the decades after Castro’s forces toppled dictator Fulgencio Batista in 1959. Mr Castro stepped aside 10 years ago after suffering a severe gastrointestinal illness, and before his 90th birthday in August he told supporters he expected to die soon.He led a guerrilla coup in 1959 to overthrow the regime of the US-backed Batista, and remained hostile to Washington throughout his life.As US President Barack Obama moved to heal relations with Havana, Mr Castro responded: “We don’t need the empire to give us anything.” Show more It was a defining moment in the Cold War, which reached its peak a year later when the world came to the brink of nuclear war during the Cuban Missile Crisis.Mr Castro survived numerous assassination attempts by US spies, including a plot to kill him with an exploding cigar.But he clung on to power, enduring decades under a crippling US trade embargo.As its greatest ally, the Soviet Union, collapsed, Cuba remained a pariah Communist state at the cost of becoming one of the world’s poorest nations. Show more Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.