Short answers, pulled from the story.
The Pilgrimage of Grace began due to bad harvests, high grain prices, and the Dissolution of the Monasteries which removed food sources for the poor. Economic pressures from enclosures and Statute of Uses threats against northern gentry rights fueled widespread discontent across Yorkshire.
The uprising started on the 1st of October 1536 at St James Church in Louth and effectively ended on the 4th of October 1536 when the King ordered occupiers to disperse. A subsequent rebellion known as Bigod's Rebellion occurred in February 1537 before all participants were executed during that year.
Robert Aske a barrister from London and resident of the Inns of Court led the insurgents after being chosen by the movement. His family originated from Aske Hall in Richmondshire and had long been established in Yorkshire while other leaders included monks and shoemakers like Nicholas Melton.
The document contained 24 Articles outlining grievances regarding taxation land rights and religious practices within the petition given to the Duke of Norfolk. Participants sought a general pardon and promised Parliament would be held at York within a year to address these issues.
A total of 216 people were executed including lords knights abbots monks and parish priests during 1537. Robert Aske was hanged in chains at York while Sir John Bulmer and Sir Stephen Hamerton were hanged and headed on the 25th day of May 1537.