Pope Francis has died of a stroke and cardiac arrest following previous complications with double pneumonia, according to the Vatican. Here's what to know about the condition.

Hours before his death, Francis — head of the Catholic Church for 12 years — delivered his yearly blessing for Easter as well as an address through Cardinal Angelo Comastri, who led Mass at Saint Peter’s Square.

Pope Francis’ official cause of death was from “a stroke and irreversible heart failure,” according to the Vatican doctor. The pontiff’s death certificate notes that he had fallen into a coma earlier in the day before he died. Pope Francis suffered from chronic lung disease and had part of his lung removed when he was a young man.