Hipparchus was the most important Greek astronomers of his time. He very accurately cataloged over 1,000 stars and invented the mathematical science of trigonometry. Ptolemy was a great admirer of Hipparchus's research and recorded some of...

Emperor Wu of Han was the seventh emperor of the Han dynasty of China, ruling from 141–87 BC. He is one of the most famous emperors of ancient China. Emperor Wu's reign lasted 54 years — a record that was not broken until the reign of th...

Zhang Qian (d. 113 BC) was a Chinese official and diplomat who served as an imperial envoy to the world outside of China in the 2nd century BC, during the time of the Han dynasty. He was the first official diplomat to bring back reliable in...

Posidonius of Apameia or of Rhodes was a Greek Stoic philosopher, politician, astronomer, geographer, historian and teacher native to Apamea, Syria. He was acclaimed as the greatest polymath of his age. None of his vast body of work can be...

Cleopatra was the last active pharaoh of Ptolemaic Egypt, briefly survived as pharaoh by her son Caesarion. After her reign, Egypt became a province of the recently established Roman Empire. Cleopatra was a member of the Ptolemaic dynast...