Question: Which chain was founded first Blackjack Pizza or Valentino's ?
Sentence (from "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.
Relevant evidence: Yes