I thought that "medieval" times were called "men evil" times, and felt bad for anybody who had to live back then, if everyone was so evil.
A childhood belief about history

others believed things like this
- I used to think that the song "Evil Woman" was "Medieval Woman". Anon
- I used to think an evil spirit type thing called Wango lived in my dog. I was terrified of that dog.— Franklin
- I used to think that "One, two, three times a lady"
was: "one, two, three times related"Anon - When I was, like, three, i thought my cat was an evil sorcerer and would cast a spell on me. XD— Bobbet
- As a kid I thought dogs stupid but funny and that cats were evil demons. — Gemini
- I thought that "heck" was a less horrible version of hell for people who were only KIND OF evil.— Oizys