Wladimir Klitschko
Ukrainian heavy weight boxing World Champion Wladimir Klitschko (L) attends a public training session in Going April 8, 2014. Klitschko will face Alex Leapai from Australia in a title fight on April 26 in Oberhausen, Germany. REUTERS/Lukas Barth (AUSTRIA - Tags: SPORT BOXING) April 8, 2014 Reuters

In the history of boxing, heavyweights have been the biggest draws and knockouts have been emblematic of the division. Here are the top five longest-reigning heavyweight boxing champions of all time.

1 Joe Louis

Championship Reign: 11 Years and 8 Months

Joe Louis carried the boxing torch throughout the late 1930s and 10940s. He secured his first championship gold against James Braddock in 1937 and he held the title for more than a decade. Apart from being the longest reigning heavyweight boxer, Louis also holds the title for most title defences - a total of 25, which is yet to be matched.

2 Wladimir Klitschko

Championship Reign: April 22nd, 2006 - Present

Wladimir Klitschko is the current International Boxing Federation (IBF), World Boxing Organization (WBO) and International Boxing Organization (IBO) World Heavyweight Champion. In modern boxing, he is the longest-reigning heavyweight boxer, with an impressive 15 consecutive title defences.

3 Larry Holmes

Championship Reign: 7 Years and 3 Months

Larry Holmes is a heavyweight champion from 1978 to 1985, who defended his title over 20 times. He took home the World Boxing Council (WBC) Heavyweight Champion title in 1978, which was later on handed-over to become the IBF World Heavyweight champion. He lost his championship and reign to Michael Spinks later on.

4 Jack Dempsey

Championship Reign: 7 Years and 2 Months

Jack Dempsey was hailed as the king of boxing from 1919 to 1926. He defeated the man who ended the reign of Jack Johnson, Jess Wiliard and reigned as the heavyweight champion for more than seven years. Dempsey remained affluent after his retirement and dies of natural causes in 1983.

5 John L. Sullivan

Championship Reign: 7 Years

John L. Sullivan is the last heavy-weight champion of bare-knuckle boxing and the first heavyweight champion of gloved boxing. In the late 19th century, he was an active boxer although the sport was illegal and underground across majority of the countries of the world. He lost his long-reigning title to James J. Corbett in 1892, which was also his last professional fight.