Jakob Ingebrigtsen testified against his father Gjert Ingebrigtsen in court on Tuesday, alleging physical and psychological abuse.
What happened?
The 24-year-old Olympic champion told the court his father was violent towards him and his sister.
He recounted an incident where his father kicked him in the stomach after he fell while riding a scooter.
This incident occurred when Jakob Ingebrigtsen was in primary school.
Why it matters for Jakob Ingebrigtsen
Gjert Ingebrigtsen denies the accusations of abuse, which also involve his 18-year-old daughter.
Jakob Ingebrigtsen felt controlled and manipulated by his father, he said.
The trial is set to continue until mid-May.
What comes next?
Jakob Ingebrigtsen's younger sister is expected to testify against their father in the coming days.
Gjert Ingebrigtsen coached his sons, including Jakob, until 2022.
Jakob Ingebrigtsen won gold in the 1,500 meters at the 2021 Tokyo Olympics and the 5,000m at the 2024 Paris Games.
He is also a twice world champion over the distance, with titles in the 1,500 and 3,000m at the indoors just last weekend.
Gjert Ingebrigtsen currently coaches middle-distance runner Narve Gilje Nordås.
The allegations against Gjert Ingebrigtsen involve psychological and physical abuse of two of his seven children.
Jakob Ingebrigtsen and his brothers are among the most well-known athletes in Norway.
The trial is being closely watched in Norway, where the Ingebrigtsen family is highly respected in the athletics community.
Jakob Ingebrigtsen's testimony is a significant development in the case against his father.
The outcome of the trial is still uncertain, with Gjert Ingebrigtsen denying all allegations.
Jakob Ingebrigtsen's decision to testify against his father has sparked a national conversation about abuse and athletics in Norway.
The World Indoor Athletics Championships in China were a recent success for Jakob Ingebrigtsen, but this trial has brought attention to a different aspect of his life.