She would have expected people to name figures such as Quintus Lollius Urbicus, who became governor of Roman Britain
Look, I know everyone in Britain is required to know the names and dates of all the monarchs going back to the 9th century, but expecting everyone to be able to come up with that name when put on the spot is going a little too far.
It is often heard from non-native speakers and will probably be understood, but in the absence of other context it will be perceived as slightly odd. Perhaps it’s on the way to being widely recognized as fully “correct” but I don’t think it’s there yet.