Elizabeth was an Empress?

Queen Elizabeth the Queen mother is the empress - Last empress of India

Good grid, but to be honest, as the items in the Empresses group are the only ones that contain women's names,'Women's Names' is perfectly valid as an answer , since there's nothing more specific needed to differentiate that group from the others.

I suppose Saint Helena is a sort of hint, but she wouldn't have been a saint when she was an empress. It's one of those "three-quarters excllent" grids that's so nearly there but let down by the last group.