Year 200 (CC) was a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar. Events By Place World Human population reaches about 257 million. Roman Empire Septimus Severus visits Syria, Palestine and Arabia. Palestine, benefiting from the benevolent policies of Severus, sees a significant economic revival. The province of Numidia's taken from the African proconsul and made an Imperial province. Asia Chinese warlord Cao Cao defeats Yuan Shao in the bat… (More on 200)