Question: Docs Keepin Time was a quarter horse who portrayed the title character in the film adaptation of the novel by author of what nationality?

Context paragraphs:
Rugged Lark: Rugged Lark (May 1, 1981 – October 26, 2004) was Quarter Horse stallion who was a two time American Quarter Horse Association (or AQHA) World Show Superhorse as well as being a three time AQHA World Champion.

Beyer Speed Figure: The Beyer Speed Figure is a system for rating the performance of Thoroughbred racehorses in North America designed in the early 1970s by Andrew Beyer, the syndicated horse racing columnist for The Washington Post.  First published in book form in 1975, Daily Racing Form began incorporating Beyer Speed Figures in a horse's past performances in 1992 and the system now assigns a Beyer number for each horse race.  Overall, the number reflects not only the winning time, but the time of the race and the inherent speed of the track over which it was run.  On the Beyer scale, the top stakes horses in the United States and Canada earn numbers in the 100s, while extremely strong performances can rate as high as the 120s.  In Europe, Timeform has a similar rating scale that yields a number, but with a different value.  The popular rule of thumb for a rough equivalent of the Timeform score is to deduct 12-14 points to achieve the Beyer figure.  For American Quarter Horse racing, the Speed index rating system is used.

All American Futurity: The All American Futurity is a race for two-year-old American Quarter Horse racehorses run at Ruidoso Downs Race Track in Ruidoso Downs, New Mexico on Labor Day.  It is the last leg of the AQHA Triple Crown that has only been won once, by Special Effort in 1981.  A $4 million bonus was once offered to the horse that could sweep all three Triple Crown races.  It started in 1959, with a purse of $129,686.85.  It has always billed itself as the richest race in American Quarter Horse racing, In 1978, the purse was over a million dollars and in 1982, the winner's portion of the purse totaled over a million dollars for the first time.  The 2015 version of the race will have a purse of $3,000,000 with the winners share being $1,500,000, making it one of the richest races in North America.

Docs Keepin Time: Docs Keepin Time (1987 - March 15, 2013) was a black American Quarter Horse who portrayed Black Beauty in the 1994 film adaptation of Anna Sewell's novel.  Docs Keepin Time also portrayed The Black in the American television series "The Adventures of the Black Stallion".

Barbara L: Barbara L (1947–1977) was an American Quarter Horse that raced during the early 1950s and often defeated some of the best racehorses of the time.  She earned $32,836 (about $ as of 2017) on the race track in 81 starts and 21 wins, including six wins in stakes races.  She set two track records during her racing career.  After retiring from racing in 1955, she went on to become a broodmare and had 14 foals, including 11 who earned their Race Register of Merit with the American Quarter Horse Association (AQHA).  Her offspring earned more than $200,000 in race money.  She died in 1977 and was inducted into the AQHA's American Quarter Horse Hall of Fame in 2007.

Two Eyed Jack: Two Eyed Jack was a Quarter Horse stallion and showhorse, and the leading all time sire of American Quarter Horse Association (or AQHA) Champions.

Easy Jet: Easy Jet (1967–1992) was an American Quarter Horse foaled, or born, in 1967, and was one of only two horses to have been a member of the American Quarter Horse Association (or AQHA) Hall of Fame as well as being an offspring of members.  Easy Jet won the 1969 All American Futurity, the highest race for Quarter Horse racehorses, and was named World Champion Quarter Race Horse in the same year.  He earned the highest speed rating awarded at the time—AAAT.  After winning 27 of his 38 races in two years of racing, he retired from the race track and became a breeding stallion.

Docs Okie Quixote: Docs Okie Quixote (1980—1985), AQHA #1613457, was a sorrel Quarter Horse stallion.  In 1984, he became the second horse ever to win the NCHA Triple Crown, and 1st to be owned, trained, and ridden by the same person, Joe Heim, of Thackerville, OK.

Black Beauty: Black Beauty is an 1877 novel by English author Anna Sewell.  It was composed in the last years of her life, during which she remained in her house as an invalid.  The novel became an immediate best-seller, with Sewell dying just five months after its publication, but having lived long enough to see her only novel become a success.  With fifty million copies sold, "Black Beauty" is one of the best-selling books of all time.

Road to the Horse: Road to the Horse is an annual colt-starting competition held at the Alltech Arena in the Kentucky Horse Park in Lexington, Kentucky.  Three trainers are invited to choose a colt from a remuda of untouched three-year old Quarter Horses provided by the American Quarter Horse Association.  They then have a specified amount of time over three days to gently get a saddle and tack on the colt and ride it.  Road to the Horse is owned and produced by Tootie Bland.  In the past the competition has been held in the Cowtown Coliseum in Fort Worth, Texas and Murfreesboro, Tennessee.

Supporting paragraphs: Docs Keepin Time Black Beauty
Answer: English