1911 Encyclopædia Britannica/Primero

PRIMERO (Span. first), a card game of Spanish origin, which Strutt calls “the oldest game of cards played in England.” It is described as having a close resemblance to Ombre (q.v.), by which it had been superseded. In both games the spadillo or ace of spades was the best card, but Primero was played with six cards and Ombre with nine. The exact method of play is uncertain.