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Billy was born with a condition called tetralogy of Fallot with pulmonary atresia, a severe heart defect that occurs in approximately one in 2,500 babies.

Konieczny brought unusual charisma and nobility to the designated villain of Wagner’s epic tetralogy, and his Dutchman is likewise a complex creation.

This one was a tetralogy: The Filipino champion and his Mexican rival met four times over eight years.

Asana Work Management Platform My life is quite complex now, and I have all these complicated projects like building apps, or building the four-part “Sznz” tetralogy.

Each of the three acts in its new production of “Die Walküre,” the second opera in Wagner’s tetralogy, which opens on Sunday, has a highly different staging, each devised by a different creative team.