Greeks
Ancient Romans would throw walnuts at a wedding. They did so because they believed it would increase fertility in the wife.
The rich Romans did. The poor Romans who could not afford to throw parties ate their food from a sitting position.
Javelin throw
yes but instead they used a heart filled with small stones
The Greeks believed that Zeus had power over weather and that he could throw lightning bolts as weapons. He could shapeshift and frequently used this to engage in affairs.
If you have supersticions, you throw salt over your shoulder to get rid of them
The Romans as they had all the power would throw the early christians to the lions to get rid of them as they thought they would become more powerful then them.
The second thing Romans had to do before declaring war was to throw a blood stained javelin into enemy territory.
For the same reasons we do: for fun, celebrations, social networking.
It's not an idiom exactly. Romans used to throw Christians into an arena with lions as a form of execution. The phrase has come to mean any situation where someone is put into a situation where there's no way for them to succeed, or into a situation that's far over their head.
The Romans persevered over Carthage .
The second thing Romans had to do before declaring war was to throw a blood stained javelin into enemy territory.