The Babylonians were the first to use the number zero in the 3rd century BC. It was used as a placeholder to signify that there were none of something.
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The Romans did not have the number 0 (zero) in their mathematical system. It wasn't until the 9th century that zero was introduced into any mathematical system. It is thought to have happened first in India. Zero has been called "the last number accepted universally by mathematicians."
The Mayans
Because they needed something to represent nothing, so came up with 0.
India did not invent the number system. Indian mathematicians introduced the concept of zero. This was a key development that led to our number system which is based on place-values.
The 0 figure had its origins from the ancient Indian system of numeracy which was later called the Hindu-Arabic numeral system.