On 19th February 1408, Henry Percy, 1stEarl of Northumberland, was killed in battle against King Henry IV, after supporting Edmund Mortimer’s claim to the throne. The Percies held lands across Yorkshire, the Lakes and Northumberland, but their main seat appeared to be Leconfield until the 16thC.
On 19th February 1499, William Fechet of Harpham claimed sanctuary at St Cuthbert’s church, Durham, for assaulting William Fox on 22ndOctober, striking him in several places with a sword; he assumed that Fox had died from his wounds, and fled.
On 19th February 1537, Sir Ralph Ellerker, the elder, chased Sir Francis Bigod and his men out of Beverley, and took 62 prisoners, who were taken to Hull. Bigod escaped. This appeared to be the end of the Pilgrimage of Grace in East Yorkshire.
On 19th February 1944, a Halifax bomber crashed 2m NNW of Hornsea shortly after take-off, killing all 7 crew. Photo -notice in Atwick church. Sadly, I was unable to find the memorial.