Do all Coats of Arms have a motto?

Do all Coats of Arms have a motto?

Peter O'Donoghue (Bluemantle Pursuivant ) gives expert video advice on: What is a Coat of Arms?; Can anyone have a Coat of arms?; Where would they come from? and more...

Not all Coats of Arms have a motto. It's not compulsory, and they're not controlled in the same way that Coats of Arms are, so families can change them. Lots of families want the same motto and there's no regulation of them.