Because it is "before" the event - BCE standing for Before the Common Era, (or Before the Christian Era). The year before it is -1 and the year before that is -2 .
Imagine a child talking about his mother and counting if from the year he was born. In the child's system he was born in 0 ME (My Era) and celebrated his tenth birthday in 10 ME. His mother is 25 years older than him and he sees her as being born in -25 BME (Before My Era) and she married in -5 BME (Before My Era)
BC, which is Before Christ, and BCE, which is Before Common Era, actually refer to the same thing. Years in BC/BCE work in reverse. So 12 BC/BCE came before 5 BC/BCE.
500 Bce - 400 Bce
ce and bce or bc and bce
The practice of writing and scribing, probably mentioned in the Before Common Era (BCE) period.
The time frame for Ancient Greece is 2000 BCE to 1450 BCE.
There were 31 dynasties during the time of 3100 to 300 BCE
The war lasted from 499 BCE to 449 BCE.
The constellation centaurus was mentioned by Exodus in fourth century BCE, and by Aratus in third century BCE. Cladius Ptolemy catalogued 37 stars in Centaurus in second century AD.
480 BCE.
around 1,042 years
Down and dirty...the Middle East sometime around 3500 BCE. It's mentioned in the Bible in the Old Testament.
Sophocles lived in ancient Greece around the time 496 BCE - 406 BCE.