Century Oldstyle would be legally correct, and perhaps Blue Century?
The US Supreme Court requires briefs to be set in "Century family (e.g., Century Expanded, New Century Schoolbook, or Century Schoolbook)". (Times New Roman is not acceptable.)
What are the preferred Century fonts out there? I like Font Bureau's Benton Modern, which is derived from Century Expanded, but it's not called "Century" and thus wouldn't meet Supreme Court requirements.