Lauded for his greatness on the track by racing personalities and fans of the day, many appraisals of The Tetrarch decades after his death have been equally glowing. The United Kingdom's National Horseracing Museum called The Tetrarch a "phenomenon" and report that he was voted Britain's two-year-old of his century. In their description of the colt, the National Sporting Library's Thoroughbred Heritage website in the United States calls The Tetrarch "probably the greatest two-year-old of all time" and "possibly the greatest runner ever".