Who was Hypatia of Alexandria?

Hypatia of Alexandria was born (AD) around 370 and she died in March 415. Hypatia of Alexandra was from Alexandria, Egypt. Her father was a philosopher and methemactician, Theon Alexandricus. She grew under his wing and she learned much about math and philosophy. Hypatia of Alexandris was the first female mathematicians in history (AD). She invented the hydrometer which I am sure is still used around this time or maybe even more advanced. I believe hydrometer's are used in thermometer or needles to measure the amount of something.