KIDS TRIVIA

Detailed explanation-1: -Ironically, Lockhart lost all of his memory on 29 May 1993 due to a backfired Memory Charm cast by Ron Weasley’s damaged wand. Lockhart then became a permanent resident of St Mungo’s Hospital for Magical Maladies and Injuries.

Detailed explanation-2: -That said, Lockhart still received fan mail, and while he didn’t remember his past, he enjoyed the writing this led to. He may have been a fraud, but he was also allowed to write and published his book, Who Am I?, not long after his hospitalization. In the end, Lockhart never recovered from his memory loss.

Detailed explanation-3: -The accident that cost Lockhart his sanity occurred at the end of his year at Hogwarts, when he was hit by a backfiring Memory Charm that forever erased his past. He has since resided in the Janus Thickey Ward of St Mungo’s Hospital for Magical Maladies and Injuries.

Detailed explanation-4: -In Chamber of Secrets, Gilderoy Lockhart’s Memory Charm backfires due to Ron’s malfunctioning wand, leaving him with severe amnesia.

Detailed explanation-5: -According to WizardsandWhatsnot there can be but one reason : he could never have been a Death Eater and thus presented no threat to Harry and his friends unlike Professor Quirell ! Why this seems a bit candid it certainly could explain how Professor Lockhart landed in Hogwarts !