While I was at the bank today, the TV screen they have started mentioning factoids. It stated that punctuation wasn't used until the fifteenth century when the printing press was invented. Until then thewordsrantogetherlikethis.
However, as I did the research I found that wasn't exactly true. English has always used some form of punctuation, but it wasn't standardized until the invention of the printing press.
In the ninth century, the Romans started using dots to separate words.
Later, a librarian in Alexandria became the first to coin the terms "comma," "colon," and "period," although they were very different from what we use today.
It's interesting to see how grammar evolved.