The “Bohemian love knot” (Liebesknote) is special among period knots: all examples were tied from ribbon rather than cord. It appears to have been a badge of Wenzel (or Wenceslaus) of Bohemia, c.1400: the knot appears frequently in manuscripts and architecture he commissioned. [K.M. Swoboda, Gotik in Boehmen]
Johannes von Narrenstein bears: Ermine, a Bohemian love knot azure within a bordure gules.