By Stephen A. Thiele ( January 14, 2026, 1:28 PM EST) -- The concept of taking an oath of allegiance can be traced back to medieval times when people took oaths of fealty to pledge loyalty or faithful service to a monarch or a lord. Today, it is not uncommon for immigrants seeking citizenship in a new country to be required to take an oath of allegiance or oath of citizenship. Professional regulatory bodies, such as law societies, may also obligate members to take an oath of allegiance in order to be admitted....