Direct Answer
The evidence that Origen castrated himself is ancient, but disputed. The article on Origen's life and later reputation says Eusebius assumed the story was true, yet Origen's own Commentary on Matthew strongly criticizes the literal interpretation that would lead someone to do such a thing.
The Evidence for the Story
The article does not hide the report. The article says people often hear that Origen had himself made into a eunuch when he was young. It also says Eusebius assumed the story was true and explained it as an act of youthful zeal. In Eusebius's telling, Origen took Jesus' words about eunuchs for the kingdom of heaven literally and did this so he could teach both men and women without fear of temptation.
That is the main evidence in favor of the story: an early Christian historian accepted it.
The Evidence Against Treating It as Settled
The article gives two reasons for caution. First, the article says the story was spread by Bishop Demetrius after his controversy with Origen. Second, and more importantly, Origen's own writings cut against it. In his Commentary on Matthew, Origen explains Jesus' words figuratively and criticizes Christians who make themselves physical eunuchs.
The article quotes Origen saying such people act without understanding and bring reproach and shame on themselves. He even says he would not spend so much time refuting the literal interpretation unless he had met people who had dared to do it.
The Best Historical Judgment
The safest evidence-backed conclusion is that the story cannot simply be ignored, because Eusebius accepted it. But it also should not be repeated as an unquestioned fact, because Origen's own words seem to condemn the very action.
So an answer page should say: the claim has ancient support, but the article presents serious internal evidence against it. The historical evidence is therefore mixed, and the story should be treated as disputed.
Read the Evidence Yourself
The main source for this answer is that Origen article. For wider historical context, Who's Who in the Early Church? places major early Christian figures in relation to one another. Readers can also use the Church Fathers Commentary to compare early Christian comments on biblical passages before treating the question as settled, especially where later summaries of Origen disagree.
