Arthur William Holland and Charles Lethbridge Kingsford and Philip Chesney Yorke and William Browning Smith and Mountstuart Elphinstone Grant Duff, 1911 Encyclopædia Britannica (1911)
“ The term “catskin” is possibly a corruption of quatre-skin, derived from the fact that in ancient times the robes of an earl (as depicted in some early representations) were decorated with four rows of ermine, as in the robes of a modern duke, instead of the three rows to which they were restricted in later centuries. The three “catskin” earldoms are the only earldoms now in existence which date from creations prior to the 17th century. (A. W. H.*) Thomas Stanley, 1st earl of Derby (c. 1435–1504) , was the son of Thomas Stanley, who was created Baron Stanley in 1456 and died in 1459. ”
