VERY hard to find the histories of boxing championships. Some people have heavyweight title histories on the web, but I haven't seen any other weight divisions at all. Here's one for heavyweight: http://www.geocities.com/Colosseum/A...25/boxing.html
PRIDE's history for championships are not that long. I believe both heavyweight and middleweight champs are the first ones anyway.
yes indeed PRIDE just got there titles started Antonio Rodrigo "Minotaro" Nogueira became the first ever PRIDE Heavyweight Champion defeating Heath Herring, And Vanderlei Silva became the first ever PRIDE Middleweight Champion defeating Kazushi Sakuraba via doctor stoppage. Also to add in 2000 Mark Coleman won the PRIDE Grand Prix 2000 Title.
UFC is a bit more tricky they have a long history of titles, some were one shot deals like the early UFC's when the winner of the tournament won the title for each event. Later on they established different weight classes and recently they changed those weight classes according to the boxing commission in order to run shows in places like Las Vegas and New Jersey. Hopefully this helps as far as UFC title histories.
1/12/2002 | UFC 35: Throw Down Results Jens Pulver defeated BJ Penn by majority decision after five rounds, Retains Lightweight Title
Murilo Bustamante defeated Dave Menne by KO at :43 seconds of round 2, New Middleweight Champion
11/1/2001 | UFC 34 High Voltage Results Undefeated Champ retains Heavyweight Belt
Randy Couture(Champion) def. Pedro Rizzo
New Welterweight Champion
Matt Hughes def. Carlos Newton
Mandalay Bay, Las Vegas, Nevada
5/4/2001 | UFC 31 Locked and Loaded Results Randy Couture def Pedro Rizzo via Unanimous Decision
Retains UFC World Heavyweight Championship Belt
Carlos Newton def Pat Miletich via Choke Submission
New UFC World Welterweight Champion
Trump Taj Mahal, Atlantic City, NJ
2/23/2001 | UFC 30 - The Battle on the Boardwalk Tito Ortiz retains Middleweight Championship Belt
Jens Pulver is New UFC Bantamweight Champion
Trump Taj Mahal, Atlantic City, NJ
12/16/2000 | UFC 29 Defense of The Belts Results Tito Ortiz retains UFC Middleweight Championship
Pat Miletich retains UFC Lightweight Championship
Tokyo, Japan
11/17/2000 | UFC 28 High Stakes Results Randy Couture is the UFC Heavyweight Champion
Trump Taj Mahal, Atlantic City, NJ
6/9/2000 | UFC 26 Ultimate Field of Dreams Results Kevin Randleman is the UFC Heavyweight Champion
Pat Miletich is the UFC Lightweight Champion
Cedar Rapids, Iowa
4/14/2000 | UFC 25 Ultimate Japan 3 Results Tito Ortiz is the UFC Middleweight Champion
Tokyo, Japan
3/10/2000 | UFC 24 First Defense Results Kevin Randleman is the UFC Heavyweight Champion
Lake Charles, LA
11/19/1999 | UFC 23 Ultimate Japan 2 Results Kenichi Yamamoto is the UFCJ Japanese Champion
Kevin Randleman is the UFC Heavyweight Champion
Tokyo, Japan
9/24/1999 | UFC 22 There Can Only Be One Champion Frank Shamrock is the UFC Middleweight Champion
Lake Charles, LA
7/16/1999 | UFC 21 Return of the Champions Results Pat Miletich is the UFC Lightweight Champion
Cedar Rapids, IA
5/7/1999 | UFC 20 Battle for the Gold Results Bas Rutten is the UFC Heavyweight Champion
Birmingham, AL
1/8/1999 | UFC 18 Road to the Heavyweight Title Pat Miletich is the UFC Lightweight Champion
New Orleans, LA
10/16/1998 | UFC Ultimate Brazil Results Pat Miletich is the UFC Lightweight Champion
Frank Shamrock is the UFC Middleweight Champion
Sao Paulo, Brazil
5/15/1998 | UFC 17 Redemption Results Frank Shamrock is the UFC Middleweight Champion
Mobile, AL
3/13/1998 | UFC 16 Battle in the Bayou Results Pat Miletich is the UFC XVI Lightweight Champion
Frank Shamrock is the UFC Middleweight Champion
New Orleans, LA
12/21/1997 | UFC Ultimate Japan 1 Results Kazushi Sakuraba UFC Japan Heavyweight Champion
Frank Shamrock is the UFC Middleweight Champion
Randy Couture is the UFC Heavyweight Champion
Yokohama, Japan
10/17/1997 | UFC 15 Collision Course Results Mark Kerr is the UFC XV Heavyweight Champion
Maurice Smith is the UFC Heavyweight Champion
Bay St. Louis, MS
7/27/1997 | UFC 14 Showdown Results Kevin Jackson is the UFC XIV Middleweight Champion
Mark Kerr is the UFC XIV Heavyweight Champion
Maurice Smith is the UFC Heavyweight Champion
Birmingham, AL
5/30/1997 | UFC 13 The Ultimate Force Results Guy Mezger is the UFC XIII Lightweight Champion
Randy Couture is the UFC XIII Heavyweight Champion
Vitor Belfort is the UFC Superfight Champion
Augusta, GA
2/7/1997 | UFC 12 Judgement Day Results Jerry Bohlander is the UFC XII Lightweight Champion
Vitor Belfort is the UFC XII Heavyweight Champion
Mark Coleman is the UFC Superfight Champion
Dothan, AL
9/20/1996 | UFC 11 The Proving Ground Results Mark Coleman is the UFC XI Champion
Augusta, GA
7/12/1996 | UFC 10 The Tournament Results Mark Coleman is the UFC X Champion
Birmingham, AL
5/17/1996 | UFC 9 Motor City Madness Results Dan Severn is the UFC Superfight Champion
Detroit, MI
2/16/1996 | UFC 8 David vs. Goliath Results Don Frye is the UFC VIII Champion
Ken Shamrock is the UFC Superfight Champion
Bayamon, Puerto Rico
9/8/1995 | UFC 7 The Brawl in Buffalo Results Marco Ruas is the UFC VII Champion
Ken Shamrock remains the UFC Superfight Champion
Buffalo, NY
7/14/1995 | UFC 6 Clash of the Titans Results Oleg Taktarov is the UFC VI Champion
Ken Shamrock is the UFC Superfight Champion
Casper, WY
4/7/1995 | UFC 5 Return ot the Beast Results Dan Severn is the UFC V Champion
Charlotte, NC
12/16/1994 | UFC 4 Revenge of the Warriors Results Royce Gracie is the UFC IV Champion
Tulsa, OK
9/4/1994 | UFC 3 The American Dream Results Steve Jennum is the UFC III Champion
Charlotte, NC
3/11/1994 | UFC 2 No Way Out Results Royce Gracie is the UFC II Champion
Denver, CO
11/12/1993 | UFC 1 The Beginning Royce Gracie is the UFC I Champion
Denver, CO
I'm Interested in Boxing Title Histories and UFC Title Histories as well. http://www.boxrec.com/ has some decent title match listings for WBA WBC IBF WBO for all weight divisions but it can be a little confusing at times. I highly recomend the site Hisa sugested I refer to the sight a lot. I did a search for boxing title histories about six months ago but couldn't find any other credible sights and practically no sights for the lighter weight divisions.