Short answers, pulled from the story.
Saint Jerome, born Eusebius Sophronius Hieronymus around 342 to 347 and died on the 30th of September 420, was an early Christian priest, theologian, translator, and historian. He is best known for translating the Bible into Latin, the version that became the Vulgate, and for his commentaries on the whole Bible.
Jerome chose to translate the Old Testament from the original Hebrew because he believed mainstream Rabbinical Judaism had rejected the Septuagint over mistranslations and Hellenistic heretical elements. His decision went against the advice of most other Christians, including Augustine, who considered the Septuagint inspired.
Jerome began the work in 382 by correcting the existing Latin New Testament, turned to translating the Hebrew Bible by 390, and completed the project by 405. The Council of Trent declared the Vulgate authoritative in 1546.
Jerome was forced to leave his position in Rome soon after his patron Pope Damasus I died on the 10th of December 384. The Roman clergy opened an inquiry into allegations that he had an improper relationship with the widow Paula, amid wider hostility over his criticism of the clergy and his influence on aristocratic women.
Saint Jerome is depicted with a lion because of a hagiographical belief that he once tamed a lion in the wilderness by healing its paw. Scholars regard the story as a figment found in the thirteenth-century Golden Legend, possibly derived from the Roman tale of Androcles or confusion with Gerasimus.
Jerome wrote extensively beyond the Vulgate, including biblical commentaries, the biobibliography De Viris Illustribus produced between 392 and 393, the historical Chronicon, two biblical onomastica, and a large body of letters. He is the second-most voluminous writer in ancient Latin Christianity after Augustine of Hippo.