Translation:He was one of the great painters of the seventeenth century.
"He was one of the great painters of the XVII century" should be admitted. Reported.
I don't think we accept Roman numerals if the original has words. But will check other sentences.
Ok... I was reading stuff and I found out that, in English, ordinal roman numbers are not used for couting centuries. It's a phenomenon that, apparently, happen just in romance languages (I'm a romancec language speaker, that's why xD):
So, it's incorrect :).