Saint Michaelmas Day

Interviewing Ripon locals about the tower:

"When I was younger, we used to walk up there when it was dark. And it just felt so scary. We couldn't stay long." 

Ian Aspinall, Ripon local

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1350. — On Michaelmas Day, John de Baildon, a Lay Brother of Fountains Abbey, 

was murdered on Micklehow (now called redundantly Micklehow Hill), near Ripon. 
William Lister of Ripon, senior, was accused of the murder, but was acquitted. 3 
Micklehow is a lofty eminence in the township of Markington-cum-Wallerthwaite 
about five miles from Ripon, formerly belonging to Fountains. Upon the summit of 
the hill was a chapel, dedicated to S. Michael, and known as S. Michael's de Monte, 
built by the Abbey about 1200. 4 

[Source: http://www.ebooksread.com/authors-eng/william-paley-baildon/baildon-and-the-baildons-a-history-of-a-yorkshire-manor-and-family-volume-3-lia/page-11-baildon-and-the-baildons-a-history-of-a-yorkshire-manor-and-family-volume-3-lia.shtml]

There is literally no other reference ANYWHERE to this murder? I cannot find any other information about it. How odd.

And what is Michaelmas day?

29 September
Michaelmas Day is the feast of Saint Michael the Archangel, celebrated on 29 September. St. Michael is the patron saint of the sea and maritime lands, of ships and boatmen, of horses and horsemen. He was the Angel who hurled Lucifer (the devil) down from Heaven for his treachery.