Directum was by Director out of Stemwinder, foaled in 1889 and bred by John Green of Dublin, California. He was leased to Monroe Salisbury and under the driving of John Kelley became the king of trotters as a colt, taking a mark of 2:05 1/4 on October 18, 1892 at Nashville. As a four-year-old Directum was the fastest trotting stallion; fastest four-year-old trotter; winner of the fastest heat by a four-year-old; and shared with Alix the fastest heat trotted at that time. He was purchased by William E. Speir, Glens Falls, New York in 1898 for $21,000, and was in stud at his Suburban Stock Farm. Directum was then purchased at auction in 1901 by M. W. Savage for $12,100 and placed at stud in Minnesota, where he remained until his death in November 1909.
Published in the Harness Racing Museum's 1994 book, The Immortals