With the exception of some older breeds like Arabians, Barbs, Andalusians, Akhal Tekes and things along that line, most breed are a combination of other breeds.
Ex: AQHA is made up of Thoroughbreds, Spanish jennets (or Zenates), Arabs, Barbs and Andalusians.
Foundation bloodlines are said to...
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A lot of lines of Saddlebreds have TBs as the foundation sires and tend to look a little "thorougbreddy." These strains also make good dressage and jumping horses. My mare is half-Saddlebred and her ASB line goes back to Gaines Denmark, a TB stallion.