Pope Francis has met with an Argentine judge who played a key role in the recent convictions of two former military officers for one of the most notorious crimes of the country's Dirty War.

La Rioja judge Daniel Ruben Herrera Piedrabuena ordered new expert investigations into the 1976 death of Bishop Enrique Angelelli, a left-leaning bishop killed in an automobile crash shortly after Argentina's military seized power.

For decades, officials insisted the death was accidental. But Piedrabuena's investigation determined he had been assassinated, and the La Rioja court agreed in July in sentencing two ex-military officers to life in prison.

The Holy See provided documentation to the court showing Angelelli had warned Rome of his problems with the military.

The Vatican provided no details of Francis' meeting Monday with Piedrabuena.