English: oath of allegiance
Welsh: llw teyrngarwch
Subject: Cyfiawnder a threfn
Welsh definition: The Oath of Allegiance (Judicial or Official Oath) is a promise to be loyal to the British monarch, and his or her heirs and successors, sworn by certain public servants in the United Kingdom, and also by newly naturalised subjects in citizenship ceremonies.
Plural: llwon teyrngarwch
Notes: Gweler hefyd affirmation of allegiance / cadarnhad teyrngarwch