Question: which is the eldest, Blackjack Pizza or Papa Murphy's?

Context paragraphs:
Papa John's Pizza: Papa John's Pizza is an American restaurant franchise company.  It runs the third largest take-out and pizza delivery restaurant chain in the United States, with headquarters in Jeffersontown, Kentucky, a suburb of Louisville.

Papa Gino's: Papa Gino's, Inc. is a restaurant chain based in Dedham, Massachusetts specializing in American-style pizza along with pasta, subs, salads, and a variety of appetizers.  There are over 150 Papa Gino's locations in Connecticut, Maine, Massachusetts, New Hampshire, and Rhode Island.

Blackjack Pizza: Blackjack Pizza is a Colorado-based pizza delivery chain founded in 1983 by a former Domino's Pizza employee, Vince Schmuhl, because Domino's Pizza was the only major pizza delivery company in the Rocky Mountain region and he thought customers would appreciate an alternative.  The pizza chain is the largest in Colorado with 800 employees, some of whom work part-time.  On January 1, 2013, Blackjack Pizza was acquired by Askar Brands.

PJI: PJI Korea Co, Ltd. (Papa John's International Korea Co, Ltd., hangul:피제이아이코리아, PJI코리아 (파파존스인터내쇼날코리아)) is a Korean pizza franchise.  Headquartered in Seoul, Korea, it was established in 2005.  It is a branch of the United States restaurant chain Papa John's Pizza.

Big Mama's &amp; Papa's Pizzeria: Big Mama's & Papa's Pizzeria is a pizza restaurant chain primarily located in Southern California.  The chain is notable for its extremely large "Giant Sicilian" pizza, which is claimed to be the largest deliverable pizza in the world.  Additionally, the chain gained notoriety when, during the 2014 Academy Awards, host Ellen Degeneres had Big Mama's pizzas delivered onstage.

Papa's Tomato Pies: Papa's Tomato Pies is a historic pizzeria selling tomato pies in New Jersey.  It was founded by Giuseppe "Joe" Papa in 1912 on South Clinton Avenue in Trenton, New Jersey.  Papa's is the oldest family owned and longest continuously operating pizzeria in the United States.  Papa's is the second oldest pizzeria in the United States after Lombardi's Pizza, however Lombardi's closed for a decade from 1984 to 1994 and was reopened under new management.

Rehua: In Māori mythology, Rehua is a very sacred personage, who lives in Te Putahi-nui-o-Rehua in Rangi-tuarea, the tenth and highest of the heavens in some versions of Māori lore.  Rehua is identified with certain stars.  To the Tūhoe people of the North Island he is Antares.  Others say he is Betelgeuse, or Sirius.  Because he lives in the highest of the skies, Rehua is untouched by death, and has power to cure blindness, revive the dead, and heal any disease (Orbell 1998:119-120).  He is a son of Rangi and Papa, and the father of Kaitangata, as well as the ancestor of Māui (Tregear 1891:381).  A Ngāi Tahu legend from the South Island speaks of Rehua as the eldest son of Rangi and Papa, who first manifested as lightning, but assumed human shape when he travelled into the skies.  Later his brother Tāne went to pay him a visit, Rehua had birds in his hair, feeding on his lice.  Rehua had his servants cook and prepare the birds as a meal for Tāne, who was shocked and declined to eat them because the birds had eaten the lice from Rehua's head, which was extremely tapu (sacred).  However Rehua gave him birds to bring down to this world, and showed him how to snare them.  Tāne also brought with him the fruit trees that the birds fed on, and so it is that there are forests and birds on the earth (Orbell 1998:119).

Sacramento Republic FC: Sacramento Republic FC is an American professional soccer team based in Sacramento, California.  It plays in the Western Conference of the United Soccer League.  Co-founded by Warren Smith and Joe Wagoner in 2012, the team started play in 2014 at Hughes Stadium, a 20,231 seat stadium.  They moved mid-season to their current home at Papa Murphy's Park.  Since then, Republic FC won the 2014 USL championship and made the playoffs three times.  With fan support and attendance, the team prepared an expansion bid for Major League Soccer, which was submitted in January 2017.  On May 15, 2017, MLS bid proponent Sac Soccer & Entertainment Holdings, led by Kevin Nagle, officially acquired Sacramento Republic FC from President and Co-Founder Warren Smith.  The team is working with the city of Sacramento to build a $226 million stadium in the large Railyards urban infill project.

Papa Murphy's Park: Papa Murphy's Park (formerly known as the Cal Expo Multi-Use Sports Field Facility and Bonney Field) is a sports venue located on the grounds of Cal Expo in Sacramento, California.  The soccer-specific stadium has a capacity of 11,569 and includes a full-sized (120 x 80 yard) soccer field.  Papa Murphy's Park is the current home of Sacramento Republic FC soccer team and former home of PRO Rugby team, Sacramento Express.

Papa Murphy's: Papa Murphy's, a business based in Vancouver, Washington, United States, is a take-and-bake pizza company.  It began in 1995 as the merger of two take-and-bake pizza companies: Papa Aldo's Pizza (founded in 1981) and Murphy's Pizza (founded in 1981).  The company and its franchisees operate more than 1,300 outlets in the United States and Canada.  Papa Murphy's is the fifth-largest pizza chain in the United States.

Supporting paragraphs: Blackjack Pizza Papa Murphy's
Answer: Papa Murphy's