As marshal and deputy to his father-in-law, William Flower, Norroy King of Arms, he participated in heraldic visitations throughout northern England.
This manuscript forms a folio volume of 104 pages, and includes the pedigrees of 112 families, each illustrated with armorial bearings.
[5] Glover himself completed visitations of Cheshire in 1580 on behalf of Flower (published 1882),[8] of Staffordshire in 1583,[9] and of Yorkshire in 1584–85 (privately printed 1875).
Glover introduced the copying of charters and other documents into the visitation records to support claims of ancestry, a marked innovation over the practice of his predecessors.
His manuscript genealogies of the nobility in Latin were translated and edited by Milles, with assistance from Sir Robert Cotton, Robert Beale, Camden, Nicholas Charles, Michael Heneage, Thomas Talbot and Matthew Pateson, under the title The Catalogue of Honor, or Treasury of true Nobility, peculiar and proper to the Isle of Great Britaine (London, 1610).
Glover's manuscripts A Catalogue of Northern Gentry whose surnames ended in son and Defence of the Title of Queen Elizabeth to the English Crown remain unpublished.