You did alot for me thank you. Atlantia doesn't have any Principalities. The SCA has three Peerages. They are equal to each other in rank. They are SCA-wide.
Members wear a medallian of a laurel wreath.
White belts and open link gold chains can only be worn by them. Sir, Dame, Mistress, etc. A person is elevated to this order for his or her service to the Kingdom. Also, don't be shy about asking questions or questioning the info I gave you. You'll get slightly different slants from different people.