Near Split there's the ruins of the retirement palace of Roman Emperor Diocletian, who grew cabbage there.
Aliosha Asanovic was a croatian footballer known for having the "highest elbows" in the world.
As for the country itself its a bit confusing in the 20ties and 30ties. With genocides and counter-geneocides and what-not.
Most other stuff I know relates to the region as a whole during the byzantinian and ottoman periods and it gets fairly hard to distinguish between serbs and croations.... hmm sorry