Thanks to Boxing Press Editor in Chief Greg Goodrich for the following facts.
Copy righted 2007. All rights reserved.

Most Alphabet Heavyweight titles won: Lennox Lewis (8)- WBC, WBA, IBF, IBO, EBU and three British titles

Most Major Heavyweight titles won: James Jeffries (5)- American, British, English and two World titles

Most purported Heavyweight title fights won: James Figg (269)

Most verifiable Heavyweight title fights won: John Sullivan (33)

Most verifiable Heavyweight title defenses: John Sullivan (32)

Least successful in claiming Heavyweight titles: Jersey Joe Walcott and Tony Tucker (1-4)

Most fights with same opponent- Sam Langford vs. Harry Wills (23)

Most Heavyweight titles vacated: Lennox Lewis (8)- WBC, WBA, IBF, IBO, EBU and three British titles

Most Heavyweight Champions defeated: Evander Holyfield and Lennox Lewis (11)

Most wins by a Heavyweight Champion: James Figg (269)

Most losses by a Heavyweight Champion: Frank Craig (33)- British; Sam

Langford (47)- Colored; George Cook (54)- Australian: and Mariano Echevarria (56)- Spanish

Most weight class titles by a Heavyweight Champion: Roy Jones (4)- 160 lb, 168 lb, 175 lb and 200 lb plus

Longest title reign: Jem Mace (14 years: 1866-1890)

Longest time to reclaim title: George Foreman (21 yrs: 1973-1994)

Longest Heavyweight title vacancy- American title (1818-1841)

Longest Heavyweight fight- James Kelly vs. Jack Smith (in 1865)- lasted 186 rounds, six hours, fifteen minutes.

Shortest title reign: Henry Pearce (one day- 12/06/1805)

Shortest time to reclaim title: Jem Ward (3 days- 1/2/1827-1/5/1827)

First Heavyweight Bare knuckle fight- James Figg vs. Unknown (circa 1738)

Last Heavyweight Bare knuckle fight- John Sullivan vs. Jake Kilrain (on July 8, 1889)

Best Heavyweight Champion record: Rocky Marciano (49-0)

Worst Heavyweight Champion record: John Heenan (0-2-1)

Only brother Heavyweight Champions- (3): James ’Jem’ Ward (in 1825) and Nicholas ‘Nick’ Ward (in 1840); Leon Spinks (in 1978) and Michael Spinks (in 1985): and Vitali Klitschko (in 1999) and Vladimir Klitschko (in 2000).

Only deaf Heavyweight Champion- James Burke (in 1833 and 1839).

Only Heavyweight Champion to win title on birthday- George Foreman (in 1973).

Only Heavyweight Champion to own a Kentucky Derby Winner- John Gully (Pyrrhus I in 1846; Andover in 1854).

Only Jewish Heavyweight Champion- Daniel Mendoza (in 1794).

Only Latino Heavyweight Champion- John Ruiz (in 2001).

Only Southpaw to be Heavyweight Champion- Michael Moorer (in 1992, in 1994, in 1996)

Only Undisputed Cruiserweight and Heavyweight Champion- Evander Holyfield (in 1988 and in 1990).

Only Middleweight Champion to be Heavyweight Champion- Roy Jones, Jr. (in 1994 and in 2003).

Only Super Middleweight Champion to be Heavyweight Champion- Roy Jones, Jr. (in 1994 and in 2003).

Only World Light Heavyweight Champion to be World Heavyweight Champion- Bob Fitzsimmons (in 1897 and in 1903). Michael Spinks was Undisputed and IBF only. Roy Jones, Jr. was Undisputed and WBA only.