From a three-year-old inheriting a centuries-old throne, to a Guinness World Record holder, to an adult monarch, Uganda’s King Oyo Nyimba Kabamba Iguru Rukidi IV’s remarkable 31-year reign in Tooro Kingdom is now over.

He died on 27 August 2026, according to the kingdom’s Prime Minister Calvin Armstrong Rwomiire Akiiki. 

He described the king’s death at the age of 34 as “an immeasurable loss.’’

Uganda’s Deputy Speaker Thomas Tayebwa said Oyo’s death was “very difficult to comprehend,” remembering him as “humble, wise and calm.”

Officials have not disclosed the cause of death.

However, the kingdom had earlier said Oyo was critically ill, while local media reports say he had been battling cancer and receiving treatment in the United States.

Born on April 16, 1992, he was the son of King Patrick David Matthew Kaboyo Olimi III and Queen Mother Best Kemigisa.

In August 1995, tragedy struck the kingdom. His father died suddenly.

Weeks later, on 12 September, Oyo was installed as the King of Tooro, otherwise known as Omukama. Guinness World Records had recognised him as the world’s youngest reigning monarch.

Oyo was a toddler when he ascended to the throne. Because he was too young to govern, his mother, royal elders and regents managed the kingdom as he grew up. President Yoweri Museveni was also among those who helped guide and groom the young monarch.

Then came the turning point. In April 2010, at 18, Oyo took full operational control. A child monarch became an adult king.

His reign was part of Uganda’s unusual royal landscape.

With its royal palace in Fort Portal City in Western Uganda, the Tooro Kingdom is one of the country's constitutional kingdoms. The others are Buganda, Bunyoro, and Busoga kingdoms.

The monarchs serve as cultural rather than political leaders as Uganda remains a republic governed by an elected president.

For Oyo, the crown meant growing up as the custodian of Tooro’s history, traditions and identity.

The royal power did not stop him from going to school. After his primary and secondary education in Uganda, he graduated from the University of Winchester with a Bachelor’s degree in Business Management.

He was also actively involved in youth empowerment, education and conservation.

 King Oyo was never officially married and had no publicly recognised Queen Consort. In 2025, his mother, Queen Mother Best Kemigisa, publicly urged him to marry, saying she wanted him to have children.

The kingdom’s prime minister has, however, revealed that Oyo left behind a prince who is expected to succeed him, but the identity of the heir has not been disclosed yet.