I have a question.
If there is someone who lived in this period - 1757-1827 - how can we know say in which century did he lived in ?
He was born in the 18th century and died in the 19th century. If he was famous for something he did in the early part of his life, he would probably be described as "an 18th century writer/artist etc".
(Please see corrections to your original post, in red above.)