Short answers, pulled from the story.
Origen was a Christian scholar, ascetic, and theologian who lived from approximately 185 to 253. He served as a catechist at the Catechetical School of Alexandria and became one of the most prolific writers in late antiquity with roughly 2,000 treatises.
Origen died less than a year after his release from prison in June 251, which places his death around 252 or 253. His death resulted from the physical tortures he endured during the Decian persecution, including being stretched in stocks and kept in a dungeon.
The Hexapla was a massive comparative study of Old Testament translations that Origen began in his early twenties. It contained six columns including the Hebrew text and three Greek translations, and it introduced critical markers like the obelus and asterisk to biblical texts.
The Christian historian Eusebius alleges that Origen castrated himself or had someone else do it to ensure his reputation as a tutor. Origen never mentions this act in his surviving writings and later condemns literal interpretations of the relevant biblical passage.
Emperor Justinian I condemned Origen as a heretic in 543 and ordered all his writings to be burned. The Second Council of Constantinople in 553 may have anathematized Origen or condemned certain heretical teachings derived from his ideas on the pre-existence of souls.