Pedro Armengol Rocafort was born in La Guàrdia dels Prats^[1] in 1238 to the nobleman Arnau Armengol Rocafort. His mother died when Armengol was about eight, and his grief-stricken father immersed himself in his official duties.^[2]

The boy became quite proud and strong-willed as an adolescent during which time he became a robber and joined a group of bandits. In 1258 James I of Aragon traveled to Montpellier from Valencia. Armengol's father was a soldier in the entourage. Armengol's bandits collided with the soldiers and father and son soon recognized each other during the skirmish. Armengol surrendered. He was condemned to death, but in light of his father's meritorius service was reprieved.^[3][1]

Later that year he met Peter Nolasco in Barcelona and resolved to become a member of the Mercedarians.^[4] After completing the requisite studies, he was ordained a priest and shortly thereafter named a "redeemer", a particularly risky ministry devoted to liberating captive Christians in Moorish Andalusia and north Africa.^[2]

In 1261 with William de Bas he was sent to Murcia and freed 213 captives and in 1262 went to Granada with Br. Bernard of San Romano during which the pair freed 202 prisoners. He visited dungeons, consoled the downhearted, and spent good money buying the freedom of as many as he could. Armengol also went to Algiers in 1264 for the same mission and traveled to Tangier and Oran.^[5]

In 1266 he and Guillermo de Florencia ransomed 118 captives at Bejaia. As they were waiting to embark for Barcelona, they learned of another twenty prepared to convert to Islam in exchange for freedom. They decided that Armengol would stand hostage against the payment of an additional ransom. A year passed and the deadline expired. When the funds did not arrive on time, he was hanged from a tree. Guillermo, having arrived three days late, was told the ransom would not be accepted since Armengol was hanged. He searched for his friend's remains and found him still alive. Armengol attributed his survival to the protection of the Virgin Mary. The pair used the ransom to purchase the freedom of the captives and traveled back to Catalonia.^[2]

Armengol spent the rest of his life at the Mercedarian house in his hometown of La Guàrdia dels Prats, where he was father superior in 1291. The attempted execution had a lasting effect on Armengol: it left his neck twisted and his face became quite haggard.^[3]

Armengol died on 27 April 1304. In 1646 the church he was buried in was burnt but his remains went undamaged. Minor modifications to his tomb were made in 1653.^[4]

On 3 March 1626, Pope Urban VIII confirmed his long-standing cultus. Pope Innocent XI canonized him as a saint on 8 April 1687. Pope Benedict XIV affixed his feast as being on 27 April - the date of his death - but it was moved in 1969 to 26 April due to the reform of the General Roman Calendar. Th Mercedarians and the Diocese of Cordoba retain 27 April.

In iconography he is depicted with a noose around his neck.^[1]