Before the year of Pandora

The Salakian Empire measures time in terms of when the Sargon's human ancestors found the sunken continent of Pandora. I know "in the year of Pandora" translates into anno Pandora (abbr. AP) because of anno Domini. How would I say "before the year of Pandora," though?
 
 

Dantius

Homo Sapiens

  • Civis Illustris

Location:
in orbe lacteo
In the year of Pandora would be anno Pandorae. (assuming you want Pandora to be 1st declension)

"before the year of Pandora" would be "ante annum Pandorae".
 
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