Saint Michael de Sanctis was born as Michael Argemir. He was also known as Michael of the Saints. At the age of twelve, he came to Barcelona and asked to be received into the monastery of the Trinitarians there.
After a three-year novitiate, he took his vows at that order’s monastery of St. Lambert at Zaragoza in 1607. After meeting a Discalced Trinitarian one day, he felt drawn to that congregation’s more austere lifestyle and, after much deliberation and the permission of his superior, he entered the congregation of the Discalced Trinitarians at Madrid as a novice. He then took his vows at Alcalá, became a priest, and was twice elected superior of the monastery at Valladolid.
During his life, Michael de Sanctis led a life of prayer and mortification. He was devout towards the Holy Eucharist, and is said to have been experienced ecstasies several times during Consecration.