On 26 Jul 1469 the Yorkist army suffered a defeat against a Lancastrian army led by Robin of Redesdale at the Battle of Edgecote Moor aka Danes Moor aka Banbury. The Yorkist army was commanded by Humphrey Stafford 1st Earl Devon (age 30) and William Herbert 1st Earl Pembroke (age 46).

Thomas Vaughan (age 69), John Wogan, Henry Neville (age 32), [his grandfather] John Conyers (age 36), and brothers John Dudley (age 42) and Oliver Dudley were killed.

Humphrey Stafford 1st Earl Devon, John Conyers (age 58) and William Parr (age 35) fought.

Richard Woodville 1st Earl Rivers (age 64) and John Woodville (age 24) were captured.

There is some uncertainty about the date with some sources suggesting the 24 Jul 1469, the eve of St James' Feast day, as being the correct date.

Chronicle of Greyfriars. 25 May 1537. And the 25th day of the same month was drawn from the Tower of London [Map] unto Tyburn [Map] Sir John Bulmer knyght, Sir Stephen Hamertone knight, master Nicolas Tempest (age 57) squire, William Thurston Abbot of Fountains [Map] and Bachelor of Divinity, Doctor John Pekerynge Prior of the Blackfriars in York, Sir James Pekerelle Canon and Doctor of Divinity. And after Sir John Bowmer [and] Sir Stephen Hamertone ware but hanged and headed, and all the residue ware both hangyd, headed and quarted. And at that time was drawn from the Tower after, the Lady [his wife] Margaret Bowmer (age 26) wife unto Sir John Bulmer, and he made her his wife, but she was the wife of one Cheney, for he sold her unto Sir Bowmer; and she was drawn when she came to Newgate into Smythfelde, and there burned the same fore-none. And that same day at Tyburn was a young Friar of the Blackfriars brought up, and for because he desired the heart of him that brought him up, to have it and to burn it, the Sheriff sent him to Newgate and there was a seneyt [?] or more.

On 02 Jun 1537 Thomas Percy (age 33), Francis Bigod (age 29), and John Bulmer and [his son] Ralph Bulmer were hanged at Tyburn [Map].