Absolute Monarchs
Peter the Great
History Learning Site
St. Petersburg.Com
Modern History Sourcebook
National Maritime Museum
NNDB
Philip II of Spain
History Learning Site
Catholic Encyclopedia
NNDB
Luminarium
History Mole
Spain From Ferdinand and Isabella to Philip II
Spain Under Philip II
Catherine the Great
Modern History Sourcebook
Women's History
St. Petersburg.com
BBC
NNDB
Frederick the Great
HistoryNet
Modern History Sourcebook
1902 Encyclopedia
Fact Monster
Ivan the Terrible
NNDB
Guide to Russia
Infoplease
The Oprichnina of Ivan IV
AllRefer
Ferdinand and Isabella
Spain From Ferdinand and Isabella to Philip
Women's History - About.com
Catholic Encyclopedia
King's College - Women's History
Queen Isabella I
NNDB - Ferdinand
Luminarium - Ferdinand
Maria Theresa
NNDB
Catholic Encyclopedia
Modern History Sourcebook
Biography.Com
How Stuff Works History
History Learning Site
St. Petersburg.Com
Modern History Sourcebook
National Maritime Museum
NNDB
Philip II of Spain
History Learning Site
Catholic Encyclopedia
NNDB
Luminarium
History Mole
Spain From Ferdinand and Isabella to Philip II
Spain Under Philip II
Catherine the Great
Modern History Sourcebook
Women's History
St. Petersburg.com
BBC
NNDB
Frederick the Great
HistoryNet
Modern History Sourcebook
1902 Encyclopedia
Fact Monster
Ivan the Terrible
NNDB
Guide to Russia
Infoplease
The Oprichnina of Ivan IV
AllRefer
Ferdinand and Isabella
Spain From Ferdinand and Isabella to Philip
Women's History - About.com
Catholic Encyclopedia
King's College - Women's History
Queen Isabella I
NNDB - Ferdinand
Luminarium - Ferdinand
Maria Theresa
NNDB
Catholic Encyclopedia
Modern History Sourcebook
Biography.Com
How Stuff Works History