The real reason for Helm Hammerhead's nickname

[Eomer of the Rohirrim]

Ah yes, a nice little PR opportunity (take note Ruth Kelly!)

I suppose, Rohan is hardly Gondor. It's not as if they could have hired Gandalf as a personal tutor. If we look back to Eorl we see that they are far more 'normal' than other monarchs (I ask you, a kid on a horse?). Ok, the theory is plausible.