Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| 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 |
| --- | --- | --- | --- | --- | --- | --- |
| 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 |
| XV Primigenia | Xanten , Germany | Fortuna | 39 Caligula | 70 XX | 39-43 Moguntiacum (GS); 43-70 Castra Vetera * (GI) | Primigenia goddess of Fate. XX in Batavi revolt |
| XVI Flavia Firma | Samsat , Turkey | Lion | 70 Vespasian | post 300 | 70-117 Satala (CAP); 117-300+ Samosata * SYR | "Vespasian's steadfast 16th". Reformed XVI Gallica |
| XVI Gallica | Mainz , Germany | Lion | 41 BC Augustus | 70 DD | to 43AD Moguntiacum * (GS); 43-70 Novaesium * (GI) | Disbanded for cowardice in Batavi revolt |
| XXII Primigenia | Mainz , Germany | Hercules | 39 Caligula | post 300 | 39-c.300 Moguntiacum * (GS) | Raised for Caligula's German war |
Question:
What is the date founded/founder when the emblem was Hercules?
Answer:
39 Caligula