He was also inbred 2x4 to Eclipse , meaning that this horse was his grandsire and also appeared in the fourth generation of his pedigree .
Copenhagen 's dam was classified as a half - breed and his sire was a full - blooded Thoroughbred .
sire was also inbred 2x4 to Eclipse , meaning that this horse was sire 's grandsire and also appeared in the fourth generation of his pedigree .
Copenhagen 's dam was classified as a half - breed and his sire was a full - blooded Thoroughbred .