[Sca-cooks] Dutch ovens?

[ranvaig at columbus.rr.com]

I want to buy a pot for camping.  I know cast iron dutch ovens aren't 
really period, but they are something I can afford and don't look too 
glaring to modern eyes.  Amazon has an 8 quart one for $27 with free 
shipping.

When were dutch ovens first used (the kind that you put coals on the lid) ?

Or do you know where to buy a more period style of pot that isn't too 
expensive?
Ranvaig