The virtues of the gentleman, according to the book, were skewed towards those useful in military terms. It contained a section on the
law of heraldic arms, the
Liber Armorum, reporting on the contemporary discussion on the relationship between gentility, and the heraldic practice of "gate-keeping" the grant of coats of arms (
blazons). The book took the line that the law of arms was part of the
law of nature.
James Dallaway reprinted this
Book of Arms in his 1793
Inquiries into the Origin and Progress of Heraldry in England. The book proposed that there could be several kinds of gentlemen: those "of blood" differed from those granted
coat armour. J. P. Cooper wrote: The ''Boke's'' classification of
gentry was to be repeated by heraldic writers for two centuries and was systematised by
Ferne and
Legh under Elizabeth. He takes as sources for the assertions in the
Boke the works of
Nicholas Upton called
De Studio Militari, and the unpublished manuscript of readings in heraldry, around 1450, known as "Richard Strangways's Book" (i.e. BL
Harley Collection 2259). There are idiosyncratic ideas on the
curse of Ham underpinning the theory, with Europeans being "Hamitic"; Cooper believes the source may be the
Testament of Love of
Thomas Usk. Jacob's suggestion of another source for the work, a
Book of the Lineage of Cote Armour, does not come with direct indications of the affiliation. ==Derivative works==