He became a professed member of the Mercedarians after he experienced a sudden conversion and devoted himself to liberating captive Christians from the Moors.

He was canonized as a saint on 8 April 1687 after Pope Innocent XI approved his long-standing "cultus" - or devotion.

[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.

As they were waiting to embark for Barcelona, they learned of another twenty prepared to convert to Islam in exchange for freedom.

Guillermo, having arrived three days late, was told the ransom would not be accepted since Armengol was hanged.

[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.