Historical Crowns and Coronets, by Rank
from Heraldry: Sources, Symbols and Meaning by Ottfried Neubecker
King
France
England
Denmark, Sweden, Spain, Italy, Germany, Russia, Netherlands,
Belgium (before 1795), Belgium (after 1838)
Prince
Crown in Spain
Crown in Italy
Crown in the Netherlands and Belgium (since 1838)
Crown in Belgium (prior to 1795)
Duke
France, Spain, Belgium (prior to 1795)
Italy
Netherlands, Belgium (since 1838)
Illustrious Count
Germany
Marquis
France, Spain, Italy, Netherlands, Belgium (prior to 1795)
Belgium (since 1838)
England
Count
Normal and permitted, France
Normal, Denmark
Normal and permitted, Sweden
Normal and permitted, Spain
Normal and permitted, Italy
Normal and permitted, Germany
Permitted, Russia, Netherlands, Belgium (since 1838)
Normal, Belgium (prior to 1795)
Viscount
Netherlands
Baron
Normal, France
Normal and permitted, Denmark
Normal, Sweden
Normal, Spain
Normal and permitted, Italy, Russia
Normal and permitted, Spain
Permitted, Netherlands, Belgium (after 1838)
Normal, Belgium (before 1795)
Permitted, England
The following two sections are Historical ONLY, and do not have equivilant usages in the SCA. Do not use these on scrolls or coronets without checking your local sumptuary laws.
Knight
Spain
Italy
Netherlands, Belgium (after 1838)
Untitled Noble
Permitted, Denmark
Permitted, Italy
Permitted, Germany