The “Lacy knot” is one of the oldest knot badges, found as early as c.1195 on the counterseal of Roger de Lacy, constable of Chester [Harvey and McGuinness, A Guide to British Medieval Seals, p.52]; the knot is found in carvings at Whalley Abbey, Lancashire in 1296 (built by Earl Henry de Lasci).
Rhiannon of Camrose bears: Per pale vert and purpure, three Lacy knots Or.
Catiana de Vennes bears: Argent, three Lacy knots azure.