Sir John Heydon (died 1653) was an English Royalist military commander and mathematician, Lieutenant-General of the Ordnance at the outbreak of the First English Civil War.
Sir John Heydon (died 1653) was an English Royalist military commander and mathematician, Lieutenant-General of the Ordnance at the outbreak of the First English Civil War. (en)
Sir John Heydon (died 1653) was an English Royalist military commander and mathematician, Lieutenant-General of the Ordnance at the outbreak of the First English Civil War. (en)