21 August 1961
Kenyan political activist and President of Kenya Afican National Union, Jomo Kenyatta was released from jail after serving 9 years. During the 1952 Mau Mau rebellion, Kenyatta, together with other nationalist leaders was imprisoned by the British authorities. The rebellion took the British by surprise and rendered the country ungovernable for almost eight years. It was this rebellion that paved the way for the independence of Kenya out of the bondages of Britain. Kenyatta subsequently became president in 1964 a year after the country became independent from Britain.  
References

 Body-Avans,A.,(1951-1954),Timeline:Mau Mau Rebellion,[online],Avaliable at africanhistory.about.com [Accessed: 21 August 2013]