King Alexander I of Yugoslavia ruled the Kingdom of Serbs, Croats and Slovenes (1921–29) and of Yugoslavia (1929–34).
Constantine I was the first Christian Roman Emperor. He ruled at the beginning of the 4th century and began the evolution of the empire into a Christian state.
Serbian professional tennis player Novak Djokovic won the 2011 Wimbledon Championship, becoming the number one tennis player in the world.
Slobodan Milosevic was a politician best known as the Serbian and Yugoslavian president in the late 1980s through the '90s. After losing power in 2000, he was charged for crimes against humanity.
Prince Paul of Yugoslavia, regent of Yugoslavia following Alexander I's assassination, was deposed by a Serbian military coup after the signing of the Tripartite Pact.
Monica Seles is a former No. 1-ranked women's tennis player with nine Grand Slam titles. She is also an author and speaker, and competed on Dancing with the Stars in 2008.