The Kenya Human Rights Commission, a group that is not part of the government, is asking King Charles III to say sorry for the wrong things done by Britain when they ruled Kenya.
The king is going to Kenya for four days, starting on Tuesday, to try and understand the hardships people faced there.
Over 10,000 people were killed by British authorities during the 1950s when they stopped a group that wanted independence. About 1,000 individuals were hung after quick trials.
The rights group said they want the king to apologize in a clear and definite way.
Ten years ago, the British government officially accepted that torture had happened when the colonial administrators were in charge.
The organization said sorry and promised to give money to many veterans of the rebellion.
Some tribes in Kenya, such as the Nandi, Kipsigis, and Pokot, are asking the UK government to say sorry and give them money for the wrong things done to them during colonial times.
Some communities want the UK to give back their old objects and lands that were taken by the colonial government and are still owned by British groups.
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