The archbishop was shot dead in 1980 by an extreme right-wing commando -- largely because the church leader adamantly defended poor farmers evicted from their land.
Romero was beatified in May after a ceremony that was stalled for decades because conservatives within the Church found him too left-leaning. It was Argentinian Pope Francis, the first-ever Latin American pope, who finally gave the green light for the beatification.
Francis, who received a delegation from the Salvadoran church today, condemned those who attacked the archbishop.
"His martyrdom also continued after he died, because it was not enough that he was dead," Francis said.
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"He was defamed, slandered, dragged through the mud."
Called the "Voice of the Voiceless" because of his fervent fight for the poor, Romero was also called "imbalanced" and a "Marxist" by some Latin American critics.
After the long road to beatification, Romero, who left a powerful leftist legacy in Latin America, is one step closer to being declared a saint more than 35 years after his death.