user: Question: What is the date founded/founder when the emblem was Hercules?
Columns: ['Legion no and title', 'Main legion base', 'Emblem', 'Date founded/ founder', 'Date disband', 'Castra legionaria (legion bases) * = main base. Start date 31 BC if unspecified', 'Notes']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['XIII Gemina', 'Alba Iulia , Romania', 'Lion', '57 BC Caesar', 'post 400', '45-106 Poetovio PAN 106-270 Apulum * DC 270-400 MI', '"Twinned 13th". Crossed Rubicon with Caesar 49 BC']
SQL:

assistant: SELECT "Date founded/ founder" FROM "Table" WHERE "Emblem" = 'Hercules';