Bohemian love knot (Period)

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.