In a rapid run-through of past decades, each tweet will link to an article or image displayed on the Guardian's new "From the Archive" blog which has been specially designed for the anniversary. The tweets start from its formation after the Peterloo Massacre - which led John Edward Taylor to start a paper in support of political reform - to the present day.
An online exhibition will be launched later this month charting the evolution of the Guardian, with readers being invited to attend an event at Kings Place, which will highlight 190 moments that have shaped the newspaper's history.
Alan Rusbridger (pictured), editor-in-chief, Guardian News & Media, said: "The Guardian was launched 190 years ago today in response to the Peterloo Massacre of 1819. It's essentially been in the same family ownership (later established as a trust) throughout - a virtually unique distinction in the rapidly changing world of media. It promised to "zealously enforce the principles of civil and religious liberty (and) warmly advocate the cause of reform". From its modest roots - its initial circulation was just over a thousand - it has grown in ambition and influence. In March it reached its largest ever audience - nearly 50m people around the world (unique browsers). In the middle of a revolution in media, we thought it worth pausing to celebrate 190 extraordinary years of work in progress."
To see all 190 tweets follow @guardianlibrary
