original_query: Who is Junius and what did he contribute to the Public Advertiser?
query: Who is Junius and what did he contribute to the Public Advertiser?
answer: Junius was a pseudonym for a writer who anonymously contributed a series of political letters critical of King George III's government to the Public Advertiser between January 21, 1769, and January 21, 1772, as well as other London newspapers.