

For context in 1525:
King of England: Henry VIII (with all the wives)
King of France: Francis I (with all the fighting the Holy Roman Empire and Pope)
King of Spain: Charles V (with all the being Holy Roman Emperor and inbreeding)
Emperor of China: Jiajing (with all the torturing and murdering dissenters)
Edit: I chose these 4 because between them they were monarchs of the 4 most powerful countries in the world at the time, especially Charles of Spain and Jiajing of China but France and England were soon poised to eclipse the others.
Kongo - Afonso I Mvemba a Nzinga - first Catholic monarch of Kongo
Songhai - Askia the Great - zenith of Songhai’s power
Adal - Abū Bakr ibn Muhammad - founded city of Harar