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

<P0-S0> Jay Dee "B.J." Penn (born December 13, 1978) is an American professional mixed martial artist and Brazilian Jiu-Jitsu practitioner. <P0-S1>  Penn debuted and competed in the Ultimate Fighting Championship (UFC), and later in K-1. <P0-S2>  Prior to fighting for the UFC, he became the first American Gold medalist of the World Jiu-Jitsu Championship. <P0-S3>  In mixed martial arts, Penn has competed in the Featherweight, Lightweight, Welterweight, and Middleweight divisions. <P0-S4>  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. <P0-S5>  Penn was also a Co-champion in the UFC 41 Lightweight Tournament, due to an eventual draw opposite Caol Uno in the tournament finale. <P0-S6>  Through his tenures as champion, Penn unofficially unified the UFC Lightweight Championship (against Sean Sherk) and broke the all-time lightweight title defense record. <P0-S7>  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. <SEP> <P1-S0> Matthew Fredrick "Matt" Riddle (born January 14, 1986) is an American professional wrestler and former mixed martial artist. <P1-S1>  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. <P1-S2>  In 2014, Riddle began training for a career in professional wrestling, and made his debut in February 2015. <P1-S3>  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. <SEP> <P2-S0> The WWN Championship is a professional wrestling championship promoted by the WWNLive governing body. <P2-S1>  The inaugural champion was crowned on April 1, 2017, when Matt Riddle defeated five other men for the title. <SEP> <P3-S0> 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. <P3-S1>  He was the last Strikeforce Light Heavyweight Champion and was the last Welterweight (80 kg ) and Middleweight (95 kg ) champion of Pride Fighting Championships. <P3-S2>  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. <P3-S3>  During his career, Henderson also challenged for the UFC Middleweight Championship (2x), the UFC Light Heavyweight Championship and the Strikeforce Middleweight Championship. <P3-S4>  He was the first mixed martial artist to concurrently hold two titles in two different weight classes in a major MMA promotion. <P3-S5>  At the time of his retirement after UFC 204, he was the oldest fighter on the UFC roster. <P3-S6>  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).