 Timothy and Johanna were the great-grandparents of Percy.Shelley was born to Sir Timothy Shelley (1753–1844) and his wife Elizabeth Pilfold following their marriage in October 1791.His father was son and heir to Sir Bysshe Shelley, 1st Baronet of Castle Goring (1731–1815) by his wife Mary Catherine Michell (d.1760).