Question: The WWN Championship had an inaugural champion of which former mixed martial artist?

Context paragraphs:
Jared Rosholt: Jared Rosholt (born August 4, 1986) is an American mixed martial artist currently competing in the Heavyweight division of the World Series of Fighting.  A professional competitor since 2011, Rosholt has also competed for the UFC, Titan FC, and Legacy FC.  He is the younger brother of former mixed martial artist Jake Rosholt.

WWF Light Heavyweight Championship: The WWF Light Heavyweight Championship was a professional wrestling championship in the World Wrestling Federation (WWF, now WWE) promotion.  The title was challenged by light heavyweights at a maximum weight of 215 lbs (before deactivation, the weight limit was changed to 220Ibs).  It was created on March 26, 1981 for the Universal Wrestling Association (UWA) in a partnership between the WWF and UWA.  In 1995, the title moved to New Japan Pro Wrestling, but due to WWF's ownership of the title, it was returned to the WWF in 1997, the year in which the WWE begins the championship's lineage.  The inaugural champion in UWA was Perro Aguayo, however, the WWE considers the inaugural champion to be Taka Michinoku, with his reign beginning on December 7, 1997.  It was retired in November 2001 with X-Pac as the final champion.

Dan Henderson: Daniel Jeffery Henderson (born August 24, 1970) is an American former mixed martial artist and Olympic wrestler, who last competed as a middleweight in the Ultimate Fighting Championship.  He was the last Strikeforce Light Heavyweight Champion and was the last Welterweight (80 kg ) and Middleweight (95 kg ) champion of Pride Fighting Championships.  Additionally, Henderson was the Brazil Open '97 Tournament Champion, the UFC 17 Middleweight Tournament Champion, the Rings: King of Kings 1999 Tournament Champion and the Pride Weltwerweight Grand Prix Tournament Champion.  During his career, Henderson also challenged for the UFC Middleweight Championship (2x), the UFC Light Heavyweight Championship and the Strikeforce Middleweight Championship.  He was the first mixed martial artist to concurrently hold two titles in two different weight classes in a major MMA promotion.  At the time of his retirement after UFC 204, he was the oldest fighter on the UFC roster.  Known to be one of the greatest mixed martial artists of all time having defeated a total of seventeen MMA world champions across four major MMA promotions (UFC, PRIDE FC, Strikeforce, and RINGS).

Sean Sherk: Sean Keith Sherk (born August 5, 1973) is a retired American mixed martial artist and former UFC Lightweight Champion.  Sherk competed in the Ultimate Fighting Championship and was one of the first combatants to have been a championship competitor in multiple weight divisions (having also competed for the UFC Welterweight Championship).  He was the second UFC Lightweight Champion in the organization's history after Jens Pulver vacated his title 5 years earlier.  Sherk also spent time competing in the Japan-based organizations, PRIDE Fighting Championships and Pancrase; going undefeated in both promotions.  He holds one of the longest undefeated streaks in mixed martial arts history, with only four career losses, all to fellow-UFC Champions.  Sherk announced his official retirement from mixed martial arts competition in September 2013 having last fought three years prior.

Miesha Tate: Miesha Theresa Tate ( ; born August 18, 1986) is an American Mixed Martial Arts Pundit and former mixed martial artist who competed in the Ultimate Fighting Championship (UFC) and is a former UFC Women's Bantamweight Champion.  Primarily known for her grappling ability, Tate became a wrestler while attending Franklin Pierce High School in Tacoma, Washington and won a state championship during her senior year in 2005.  She began her professional mixed martial arts (MMA) career in 2007, and won the bantamweight championship of the Freestyle Cage Fighting promotion in 2009.  Tate gained increased recognition in 2011, when she won the Strikeforce Women's Bantamweight Championship.  She has also won a silver medal in the FILA Grappling Championships.

Frank Shamrock: Frank Shamrock (born Frank Alisio Juarez, III; December 8, 1972) is an American former mixed martial artist.  Shamrock was the first to hold the UFC Middleweight Championship (later renamed the UFC Light Heavyweight Championship) and retired as the four-time defending undefeated champion.  Shamrock was the No. 1 ranked pound for pound UFC fighter in the world during his reign as the UFC Middleweight Champion.  Shamrock has won numerous titles in other martial arts organizations, including the interim King of Pancrase title, the WEC Light Heavyweight Championship and the Strikeforce Middleweight Championship.

Matthew Riddle: Matthew Fredrick "Matt" Riddle (born January 14, 1986) is an American professional wrestler and former mixed martial artist.  A professional MMA competitor since 2008, Riddle made a name for himself by appearing on SpikeTV's "The Ultimate Fighter 7", and went on to go on a four-fight win streak in the UFC before he was fired after testing positive for marijuana in February 2013.  In 2014, Riddle began training for a career in professional wrestling, and made his debut in February 2015.  In 2016, readers of the "Wrestling Observer Newsletter" recognized him as the wrestling Rookie of the Year and the Most Improved wrestler of the year.

WWN Championship: The WWN Championship is a professional wrestling championship promoted by the WWNLive governing body.  The inaugural champion was crowned on April 1, 2017, when Matt Riddle defeated five other men for the title.

B.J. Penn: Jay Dee "B.J." Penn (born December 13, 1978) is an American professional mixed martial artist and Brazilian Jiu-Jitsu practitioner.  Penn debuted and competed in the Ultimate Fighting Championship (UFC), and later in K-1.  Prior to fighting for the UFC, he became the first American Gold medalist of the World Jiu-Jitsu Championship.  In mixed martial arts, Penn has competed in the Featherweight, Lightweight, Welterweight, and Middleweight divisions.  As a former UFC Lightweight Champion and UFC Welterweight Champion, he is one of only three fighters in UFC history to win titles in multiple weight classes.  Penn was also a Co-champion in the UFC 41 Lightweight Tournament, due to an eventual draw opposite Caol Uno in the tournament finale.  Through his tenures as champion, Penn unofficially unified the UFC Lightweight Championship (against Sean Sherk) and broke the all-time lightweight title defense record.  Penn was inducted into the UFC Hall of Fame, as the inaugural inductee in the Modern-Era Wing by career-long rival Matt Hughes, during "International Fight Week" in July 2015.

Wonder of Stardom Championship: The Wonder of Stardom Championship (ワンダー・オブ・スターダム選手権 , Wandā Obu Sutādamu Senshuken ) is a women's professional wrestling championship owned by the World Wonder Ring Stardom promotion.  The title, which in Stardom's championship hierarchy is situated as the secondary title behind the World of Stardom Championship, was introduced on June 26, 2011, and the inaugural champion was crowned on July 24, 2011, when Yuzuki Aikawa defeated Yoshiko in a decision match.  The title is often referred to simply as the "White Belt", a name famously used by All Japan Women's Pro-Wrestling (AJW) to refer to its All Pacific Championship.  The title belt was crafted by American company Top Rope Belts based on designs sent by Stardom, with a conscious decision to imitate the AJW title belt in terms of its color, with Stardom president Rossy Ogawa referring to the promotion's heyday as the "Golden Age of "Joshi Puroresu"".  The original title belt was awarded to undefeated inaugural champion Yuzuki Aikawa, when she retired from professional wrestling on April 29, 2013.  It was replaced that same night by a second identical title belt.

Supporting paragraphs: WWN Championship Matthew Riddle
Answer: Matthew Fredrick "Matt" Riddle