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)

What is the date founded/founder when the emblem was Hercules?
SELECT "Date founded/ founder" FROM table_26712 WHERE "Emblem" = 'Hercules'
SELECT "Date founded/ founder" FROM "table_26712" WHERE "Emblem" = 'Hercules'