A clarion is one of the oldest of heraldic charges, dating from c.1285 in the arms of Greville [ANA2 301]; in period it was also called a “claricord”, “claricymbal”, “rest”, or “sufflue”. There had been some debate over what exactly the clarion is meant to be: suggestions have included a spear rest, an air feed for a pipe organ, or even a rudder. Most modern authorities agree it’s a type of musical instrument, a mouth organ akin to a panpipe [Friar 253].
Robin Clarian bears: Per chevron azure and argent, three clarions counterchanged.
Ava Trudine of Tregoenning bears: Vert, a clarion argent.
Balian de Brionne bears: Azure, three clarions argent.