We are the children of many sires,   and every drop of blood in us in its turn betrays its ancestor.  Ralph Waldo Emerson

Bet Hargreaves has been collecting Cavalier King Charles Spaniel pedigrees for many years and now has about 2000. She has kindly made her "Golden Oldies" list of long-lived Cavaliers available for you to use.
Search Golden Oldies

Cavaliers.co.uk has a database of British Cavalier King Charles Spaniel pedigrees based on data provided by the Gayhalo Results Service, and contains over 28,000 entries (March 2005). A form is available for visitors to submit new pedigree information to the database.
Search UK Cavalier Pedigree Database

The US Cavaliers Online! Searchable database of Cavalier Pedigrees has nearly 50,000 entries (March 2005). Thanks to the many submissions received, it is now possible to trace a pedigree back as far as the early 1920s! Many of these early ancestors were King Charles Spaniels (known as English Toy Spaniels in the USA). You will see them designated with (KCS) after their names. It is really fascinating to be able to go back that far to see our Cavaliers' "roots".
Search Cavaliers Online! Pedigree Database

World Pedigrees has an international Cavalier pedigree database submitted by Andrew Mulcahy, based on the cavaliers Online! version. As of 2003 it contains 38,000 records.
Search World Pedigrees Cavalier Database

There is also now a Belgian database provided by A.E.N.A, which currently contains pedigrees of over 32,000 Cavaliers and 17,000 King Charles Spaniels (March 2005), including many French dogs. It has both a French and an English search interface, and also includes an input form for addition of new pedigree data.
Search A.E.N.A. Cavalier or Charlie Databases (English Interface)

Another marvellous pedigree resource comes from Cochrans Cavaliers. Susan Cochran has been researching Cavalier pedigrees for many years, and offers both a selection of "Oldies" pedigrees plus those of some very noteworthy Cavalier King Charles Spaniels.
Check out Cochrans Cavaliers