Druids - How do I get them?

I'm currently playing as the Britons and have Londinium fully upgraded but I can't build the Druid unit. Does it have anything to do with the shrine you pick or is it something else?

Druids are trained by one of the shrines. I think it's the one that gives the public order due to law bonus, I can't actually remember the name. But I do remember that I you built the shrines that eventually give you naked fanatics, woad warriors, or head hurlers you can't get druids. I you have a shrine built and it's not the one that gives druids scrape it and look on the tech tree info page of the settlment details scroll. Druids come with 3rd level barbarian temple just look on the tech tree and see which one gives druids.

Excellent, thanks very much for your help.