SCA Heraldry practice has some differences, but this is still a neat reference.
Heraldry - The Basics. Pretty nifty reference when studying this time period.
Medieval Helmet Types
The Crusades Knight orders
Cruzado Templário 1290
Nordic Yggdrasil Tree... For all you Norwegians out there with Viking ancestors.
Viking sword hilts and axes CHARACTER DESIGN REFERENCES
Viking logic--underscored with an axe.
#DoctorWho People are just...adorable.