The fictional wizarding newspaper founded by Xenophilius Lovegood is The Quibbler.
The Quibbler appears in Harry Potter and the Order of the Phoenix. Xenophilius Lovegood edits the publication, which is known for unusual stories, conspiracy theories, and claims that mainstream wizarding media rejects.
Luna Lovegood’s father uses the paper to publish Harry’s account of Lord Voldemort’s return after the Ministry of Magic and the Daily Prophet refuse to accept it. The interview gives Harry a public platform and makes The Quibbler important to the resistance against Voldemort.
The name is sometimes confused with the Daily Prophet, the mainstream newspaper in the wizarding world. The two publications occupy opposite roles: the Daily Prophet often follows official Ministry views, while The Quibbler presents eccentric and independent claims.