This was one of several cities of Chartist uprisings in England following the rejection of the 1839 Chartist Petition, one of the first attempts at a mass petition gaining 1,280,000 signatures from around the country. The Petition was presented to congress by Thomas Attwood on June 14 and was denied 235 to 46. The Newport Rising was the last large scale uprising in Wales led by Chartist leader John Frost. This specific march consisted of around 3,000 people and resulted in approximately 10-22 dead and some 50 people wounded. The Westgate Hotel was the site where arrested protestors were temporarily held during the uprising. 

https://www.parliament.uk/about/living-heritage/transformingsociety/electionsvoting/chartists/case-study/the-right-to-vote/the-chartists-and-birmingham/1839-petition/ 

https://www.theguardian.com/uk-news/2014/sep/03/revolting-newport-recalling-erasing-chartist-history