Pliny the Elder cause of death volcanic eruption
Natural History as the First Encyclopedia
Some historians consider Natural History to be the first encyclopedia ever written. It was the earliest encyclopedia to survive. There were many ancient histories written before Pliny the Elder's Natural History, but scholars still recognize Natural History as an encyclopedia, setting it apart from the other ancient histories. Regardless of if it was first, it is certainly the most significant. Through Natural History, Pliny the Elder gives modern experts a view into meanings of various things from first century Rome in a way that no other surviving text does. Each book of the Natural History covers a different topic, and the work is meant to cover every topic. Given the organization of the work, it is clear that it was meant to be a reference resource. Even modern scholars will sometimes compare an unknown object mentioned in a different ancient text with the objects described by Pliny and make comparisons. Modern scholars are also able to use Natural History to understand the traditions, fantasies, and prejudices in Ancient Rome. Some people have said that certain prejudices that have been prevalent throughout western history (such as a stigma around menstruation) were spread by Natural History.  
The work became a model for all later encyclopedias in terms of the breadth of subject matter examined, the need to reference original authors, and a comprehensive index list of the contents. It is the only work by Pliny to have survived, and the last that he published, lacking a final revision at his sudden and unexpected death in the AD 79 eruption of Mount Vesuvius.
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