Whose horse once wore this item of chest harness….?

In 2011/2012 a hoard of medieval artefacts was discovered down a well at the remains of castle of Caherduggan, near Doneraile, Co Cork. It included a complete peytrel/peytral/poitrel for a horse, which names derive from pectoral. Peytrels were worn around the horse’s chest, and although I’d never heard the name before, I recognised what it…