King Oyo Nyimba Kabamba Iguru Rukidi IV, recognised by Guinness World Records as the world's youngest reigning monarch, has died at the age of 34. The Tooro Kingdom's Prime Minister Calvin Armstrong Rwomiire Akiiki announced the king's passing on Friday, describing it as an "immeasurable loss" to the royal family and the people of Tooro. While the kingdom did not officially disclose the cause of death, reports in Ugandan media cited a government minister saying King Oyo had been critically ill and receiving treatment for cancer in the United States.
Oyo became king of Tooro — a kingdom in western Uganda, situated on the foothills of the Rwenzori Mountains near the border with the Democratic Republic of Congo — at just three years old in 1995, following the sudden death of his father. He was the 13th monarch of a kingdom founded in the early 19th century and ruled over more than two million people. A regency that included the queen mother guided the kingdom during his childhood, and Oyo assumed full royal authority upon reaching adulthood around 2010, with an official coronation marking the occasion. In 2025, Guinness World Records formally recognised him as the world's youngest reigning monarch.
Though Uganda is governed by an elected president and parliament, it officially recognises several traditional kingdoms — Tooro among them — as cultural institutions without formal political power. Despite this, these kingdoms carry significant cultural and social influence. King Oyo was known for championing causes including youth empowerment, education, climate conservation, and HIV/Aids awareness. Government minister Margaret Muhanga described the mood in the kingdom as "sombre," adding that, "as young as he was, he had an impact on his kingdom."
Tributes have poured in from across Uganda and beyond. The Buganda Kingdom, the country's largest and most influential traditional institution, mourned alongside the people of Tooro. The Federation of Uganda Football Associations honoured King Oyo as a "true friend of the beautiful game" and announced a moment of silence before all matches until 4 September. Prominent Ugandan figures including musician Juliana Kanyomozi and pop star-turned-politician Bobi Wine also paid their respects. In a gesture of remembrance, Minister Muhanga announced plans to plant a million trees in his honour during the mourning period.
Prime Minister Akiiki confirmed that the continuity of the crown is assured, noting that King Oyo — who was not officially married — leaves behind a prince as his heir, whose identity will be revealed "at the appropriate time, in accordance with the traditions and customs of Tooro Kingdom." He called on the people of Tooro to remain "united, calm and prayerful" during what he termed a profoundly difficult time.