Olav Engelbrektsson is believed to have been born at Trondenes near Harstad in Troms around 1480 as the son of Engelbrekt Gunnarsson and Jorunn.
 Engelbrekt Gunnarson was a bondefører ( a leader of farmers ) and storbonde ( a large landowner ) in Romerike in Eastern Norway around 1447.
 He kept getting in arguments and fights with the Danish bailiff Lasse Skjold and eventually killed him.
 Researchers believe that that is why Engelbrekt and Jorunn moved to Trondenes, where his son Aslak was already living because, at that time, Aslak was the wealthiest man between Bergen and Senja.
 Young Olav was raised in a home that was always opposing the Danish overseers, and that might have been one of the several influences of his attitude towards the Danes in his years as the Archbishop.

Olav Engelbrektsson was from an old landowning family in Romerike, and it is often claimed that he and his family belonged to the gentry.
 King Christian I of Denmark was supposed to have ennobled Engelbrekt Gunnarson and his descendants sometime before 1480 but, in 1961, cand.
philol.
Trygve Lysaker wrote that the documentation did not exist to such a claim.
Nevertheless, the family had a coat of arms – a blue shield showing a red rose surrounded by three lilies.

Five of Olav's relatives belonged to the clergy.
 Two of them were his paternal uncles Sakse Gunnarsson and Gunnar Gunnarson.
Gunnar was a canon in Oslo, a profession that even some of his own sons chose.
It is known that Olav and four of these relatives studied at foreign universities.
His uncle Sakse was the one who gave Olav clerical education.

There is a prevailing theory among the Norwegian genealogists that Olav Engelbrektsson was not the first member of his family to be the Archbishop of Nidaros.
 But, throughout his life, the records were more concerned with the church, the politics and the wars than with the families.
 So there may not be enough evidence to prove that Olav was the grandnephew of the 25th Archbishop Olav Trondsson, the nephew of the 26th Archbishop Gaute Ivarsson and the uncle of his own successor, Torbjørn Olavssøn Bratt, the first Lutheran "superintendent" of Trondheim.
He did help with the education and careers of Torbjørn and his brother, Jens Olavssøn Bratt, but their biographies at Norsk Biografisk Leksikon do not name him as their uncle.
  It is the same with the possibility that Olav's mother might be the daughter of Ivar Trondsson from the Aspa family in Frei in Nordmøre.
Olav Engelbrektsson is believed to have been born at Trondenes near Harstad in Troms around 1480 as the son of Engelbrekt Gunnarsson and Jorunn.  Engelbrekt Gunnarson was a bondefører ( a leader of farmers ) and storbonde ( a large landowner ) in Romerike in Eastern Norway around 1447.  He kept getting in arguments and fights with the Danish bailiff Lasse Skjold and eventually killed him.  Researchers believe that that is why Engelbrekt and Jorunn moved to Trondenes, where his son Aslak was already living because, at that time, Aslak was the wealthiest man between Bergen and Senja.  Young Olav was raised in a home that was always opposing the Danish overseers, and that might have been one of the several influences of his attitude towards the Danes in his years as the Archbishop.
Olav Engelbrektsson was from an old landowning family in Romerike, and it is often claimed that he and his family belonged to the gentry.  King Christian I of Denmark was supposed to have ennobled Engelbrekt Gunnarson and his descendants sometime before 1480 but, in 1961, cand. philol. Trygve Lysaker wrote that the documentation did not exist to such a claim. Nevertheless, the family had a coat of arms – a blue shield showing a red rose surrounded by three lilies.
Five of Olav's relatives belonged to the clergy.  Two of them were his paternal uncles Sakse Gunnarsson and Gunnar Gunnarson. Gunnar was a canon in Oslo, a profession that even some of his own sons chose. It is known that Olav and four of these relatives studied at foreign universities. His uncle Sakse was the one who gave Olav clerical education.
There is a prevailing theory among the Norwegian genealogists that Olav Engelbrektsson was not the first member of his family to be the Archbishop of Nidaros.  But, throughout his life, the records were more concerned with the church, the politics and the wars than with the families.  So there may not be enough evidence to prove that Olav was the grandnephew of the 25th Archbishop Olav Trondsson, the nephew of the 26th Archbishop Gaute Ivarsson and the uncle of his own successor, Torbjørn Olavssøn Bratt, the first Lutheran "superintendent" of Trondheim. He did help with the education and careers of Torbjørn and his brother, Jens Olavssøn Bratt, but their biographies at Norsk Biografisk Leksikon do not name him as their uncle.   It is the same with the possibility that Olav's mother might be the daughter of Ivar Trondsson from the Aspa family in Frei in Nordmøre.
Olav Engelbrektsson