What is the predicted date (year) that this Legion went missing?
Who could have wiped out the Legion? Or who do historians assume attacked them?
Was the Hadrian Wall being built upon the disappearance of the Ninth Legion, if so, was it nearly completed or only in its infant stages?
Thank You (I am also aware that the legend around the Ninth Legion is very much a mystery and so that answers may be to an extent, guesswork)
As far as i know the Legion didnt actually 'go missing'. It just disappears from records after 120AD.
The most popular theories say that it could have been destroyed in the east while fighting in the Bar Kokhba revolts, Parthia or in Armenia.
This legion was almost completely destroyed in the Boudicca revolt and it is possible that it remained a smaller detachment.