English: Arms of Grenville family of Bideford, Devon & Stowe, Cornwall: Gules, three clarions or. The armorials of the family of Granville / Grenville of Glamorgan, Devon and Cornwall is of certain form but uncertain blazon. The charges appear in the form of musical pipes of a wind-instrument, similar to pan-pipes. Authoritative sources on heraldry suggest the charges to be variously "clarions" (used by Guillim (d.1621)), the most usual blazon, which are however generally defined as a form of trumpet; "rests" is another common blazon, denoting lance-rests supposedly used by a mounted knight; "organ-rests" is also met with, a seemingly meaningless term (Gibbon (1682)). Other terms are "clavicymbal", "clarichord" and "sufflue" (used by by Leigh in his Armory of 1562 and by Boswell, 1572)[4] , the latter being a device for blowing (French: souffler) air into an organ.,[5] Guillim suggested the charge may be a rudder,[6] but in which case it is shown upside down, when compared to that charge used for example on the tomb at Callington of Robert Willoughby, 1st Baron Willoughby de Broke. Certainly in the brasses on the chest tomb of Sir John Bassett (d.1529) in Atherington Church, Devon, the charges are engraved in tubular forms with vents or reeds as used in true organ pipes. For modern shape of clarions adopted circa 17th c. see File:GrenvilleArms ModernClarions.png