Eysteinn was probably born sometime between 1120 and 1130 on the farm or Råsvoll north of Trondheim in the Verdalen valley .

[5] King Inge's reign fell within the start of the period known as the civil war era in Norway.

Before Eysteinn could return to his seat, King Inge was killed by his nephew, Håkon Herdebrei.

The title is an abbreviation for Passio Et Miracula Beati Olaui, meaning Holy Olav's sufferings and miracles.

[6] Eysteinn is recognised as a Saint by the Catholic Church and is commemorated in the most recent edition of the Roman Martyrology under the date of 27 January.

[7] The Martyrology entry (elogium) reads "At Nidros in Norway, Saint Augustine (Eystein) Erlandssön, bishop, who defended the Church committed to his care against princes and built it up with the greatest determination.