Primero (in English also called Primus, Prime, or in Italian Primiera or Spanish Primera), is a 16th-century gambling card game of which the earliest reference dates back to 1526. Primero is closely related to the game of primo visto (a.k.a. prima-vista, and various other spellings), if not the same. It is also believed to be one of the ancestors to the modern game of poker, to which it is strikingly similar.