Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_26712 ( "Legion no and title" text, "Main legion base" text, "Emblem" text, "Date founded/ founder" text, "Date disband" text, "Castra legionaria (legion bases) * = main base. Start date 31 BC if unspecified" text, "Notes" text )

### Question ###
What is the date founded/founder when the emblem was Hercules?

### Accurate SQL ###

SELECT "Date founded/ founder" FROM table_26712 WHERE "Emblem" = 'Hercules'