Conversation so far:
What year did this CPP movement occur?
This CPP movement was happening around June 12, 1949.
What did Kwame Nkrumah do upon his return to the Gold Coast?
After twelve years abroad pursuing higher education, Kwame Nkrumah returned to the Gold Coast to begin his political career as an advocate of national independence.
What happened after Kwame Nkrumah returned to the Golden Coast?
Kwame Nkrumah formed the Convention People's Party, which achieved rapid success through its unprecedented appeal to the common voter.
Are there any other interesting aspects about this article?
Kwame Nkrumah became Prime Minister in 1952 and retained this position when Ghana declared independence from Britain in 1957.
What did Kwame Nkrumah say to tens of thousands of supporters?
As the fifth of March turned to the sixth, Kwame Nkrumah stood before tens of thousands of supporters and proclaimed, Ghana will be free forever.“
What did Kwame Nkrumah speech about Ghana's independence lead to?
Kwame Nkrumah was hailed as the Osagyefo.

Question: Why is this?
Self-contained rewrite: Why did Kwame's supporters call him Osagyefo?