He was the seventh , but third surviving son of Sir Francis Slingsby and Mary de Percy , daughter of Sir Thomas Percy , executed for his part in the Pilgrimage of Grace , and sister of Thomas Percy , 7th Earl of Northumberland , and Henry Percy , 8th Earl of Northumberland . The Percies were descendants of Saer de Quincy , 1st Earl of Winchester . He was born in Scriven , Knaresborough , West Riding . After marrying Elizabeth Broard , daughter of Sir Stephen Broad of Broadshill , Sussex in 1582 , the couple took a Grand Tour of Europe , returning in 1594 . In 1596 , Slingsby discovered that water from the Tewit Well mineral spring at Harrogate , possessed similar properties to that from Spa , Belgium . In 1596 Slingsby served as a soldier on the Cadiz expedition , and again in 1597 against Spain
Pilgrimage of Grace
Pilgrimage of Grace
William Slingsby