Sir Gruffudd Vychan (c. 1395 – 1447), also spelt in English sources as Griffith Vaughan, was a Welsh knight who supported the rebellion of Prince Owain Glyndŵr against the English, and captured the Lollard John Oldcastle, who was later immortalized by Shakespeare as John Falstaff.[1] He was finally executed after the murder of Sir Christopher Talbot, son of John Talbot, 1st Earl of Shrewsbury.