Question: Hélio Gracie A patriarch of the Gracie family, he was the father of a UFC Hall of Famer considered by UFC fans to be the most influential figure in the history of what?

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Royce Gracie: Royce Gracie ( ; ] ; born December 12, 1966) is a Brazilian professional mixed martial artist for Bellator MMA , a UFC Hall of Famer, and a Brazilian Jiu-Jitsu practitioner.  He is considered by UFC fans to be the most influential figure in the history of modern MMA.  He is a member of the Gracie family.

Rorion Gracie: Rorion Gracie ( ; ] ; born January 10, 1952) is a Brazilian American Gracie Jiu-Jitsu Grand Master, a prominent member of the Gracie family, writer, publisher, producer, lecturer, and the co-founder of the Ultimate Fighting Championship.  He is the oldest son of Hélio Gracie and one of the few people in the world to hold a 9th degree red belt in Brazilian Jiu-Jitsu, and is widely recognized as the man responsible for introducing Gracie/Brazilian Jiu-jitsu to the United States and the world.

Rener Gracie: Rener Gracie (born November 10, 1983) is an American Brazilian jiu-jitsu practitioner, a head instructor at the Gracie Jiu-Jitsu Academy, and co-creator of Gracie University.  As a member of the Gracie family, he is the grandson of Grandmaster Hélio Gracie, and the second eldest son of Grandmaster Rorion Gracie, the father of Gracie jiu-jitsu in the United States.  Rener is also known as the husband of actress, model and former pro-wrestler Eve Torres.

Carlos Gracie: Carlos Gracie (September 14, 1902October 7, 1994) was a Brazilian martial artist who is credited with being one of the primary developers of modern jiu-jitsu in Brazil.  Along with his younger brother Hélio Gracie and fellow students Luis Franca and Oswaldo Fadda, Gracie helped develop Brazilian jiu-jitsu (BJJ) based on knowledge from Mitsuyo Maeda, and is widely considered to be the martial-arts patriarch of the Gracie family.  Carlos Gracie acquired his knowledge of Jiu-Jitsu by studying in Belem under Maeda and his students.  As he taught the techniques to his brothers, he created a martial arts family with Hélio and with other members of the Gracie family who provided key contributions to the style.

Ralek Gracie: Ralek Gracie ( ; born October 4, 1985) is an American Brazilian jiu-jitsu practitioner and mixed martial artist.  As the son of Rorion Gracie, he is a member of the Gracie family, and the nephew of Legends of MMA Hall of Famer Rickson Gracie and UFC Hall of Famer Royce Gracie.  He was awarded his black belt in Brazilian jiu-jitsu by his grandfather Hélio Gracie.  He is also the founder of Metamoris, a submission-only grappling promotion.

Robin Gracie: Robin Gracie is a Brazilian professional mixed martial artist and Brazilian Jiu-Jitsu practitioner.  Robin is the youngest son of Hélio Gracie.  He currently resides in Barcelona and runs the official Gracie Jiu-Jitsu Academy of Spain and teaches seminars throughout Europe and North America.  He was a Vale Tudo competitor and was a 1998 ADCC Submission Wrestling World Championship Silver Medalist.  Robin was trained by his father Hélio, and his brothers Royler Gracie, Rolker Gracie and Royce Gracie.  Robin is also notable for a widely published no holds barred fight he took within his own academy, in what was part of one of the first "Gracie Challenge", against French journeyman fighter and black belt in BJJ, Damien Riccio in 2001.

Carlson Gracie: Carlson Gracie (August 13, 1932 – February 1, 2006) was a practitioner of Brazilian Jiu-Jitsu.  He was the eldest son of Carlos Gracie, founder of the Gracie Jiu Jitsu variant of Brazilian Jiu Jitsu with his uncle Hélio Gracie, and learned the art from his uncle and his father.  He was a member of the Gracie family.

Rickson Gracie: Rickson Gracie (] ; born November 21, 1958) is a Brazilian 9th degree red belt in Gracie Jiu-Jitsu and a retired mixed martial artist.  He is a member of the Gracie family: the son of Hélio Gracie, brother to Rorion and Relson Gracie, and half-brother to Rolker, Royce, Robin and Royler Gracie.  In November 2014 he became an inductee of the Legends of MMA Hall of Fame, alongside Big John McCarthy, Pat Miletich, and Fedor Emelianenko.

Renzo Gracie: Renzo Gracie ( ; ] ; born March 11, 1967) is a Brazilian mixed martial artist and Brazilian Jiu-Jitsu practitioner.  A member of the Gracie family of Brazil, Renzo is a 6th Degree Black in Brazilian Jiu-Jitsu under Carlos Gracie Jr..  He is the son of Robson Gracie, grandson of Carlos Gracie, nephew of Carlos Gracie, Jr. grandnephew of Helio Gracie, and the 1st cousin once removed of Royce Gracie.  In mixed martial arts, Renzo has competed in the Ultimate Fighting Championship, Pride Fighting Championships, K-1, RINGS, and International Fight League (head-coaching the New York Pitbulls).  He holds notable victories over five former UFC Champions: Frank Shamrock (UFC Light Heavyweight Champion), Carlos Newton (UFC Welterweight Champion), Pat Miletich (UFC Welterweight Champion), Maurice Smith (UFC Heavyweight Champion), and Oleg Taktarov (UFC 6 Tournament Winner)

Hélio Gracie: Hélio Gracie (] ; October 1, 1913 – January 29, 2009) was a Brazilian martial artist who, together with his brother Carlos Gracie, founded the martial art of Gracie jiu-jitsu and with Luiz França and Oswaldo Fadda the martial art of Brazilian jiu-jitsu (BJJ).  According to Rorion Gracie, his father Hélio is one of the first sports heroes in Brazilian history; he was named Man of the Year in 1997 by the American martial arts publication "Black Belt" magazine.  A patriarch of the Gracie family, he was the father of Rickson, Royler, Royce, Relson, and Ultimate Fighting Championship (UFC) co-founder Rorion Gracie, among other sons and daughters.

Supporting paragraphs: Hélio Gracie Royce Gracie
Answer: modern MMA