It was founded in 1880. From 1896 to 2004 it went under the title of the Evening Argus.
It’s been published by Newsquest (Sussex) since they acquired it in 1996 from the Westminster Press, part of the Pearson Group which publishes the Financial Times. It has editorial offices in Hollingbury which it shares with its companion weekly titles for the county, the Leader series.
It’s now available as an iPhone/iPad app.
There’s also a weekly freesheet tabloid companion, Argus Lite, distributed from various railway stations in Sussex in competition with London-based pick-up freesheets such as Metro.