In the past, Bacnotan was only a vast expanse of wilderness inhabited by natives with a rudimentary form of government. There was a time when it was ruled by a despotic chieftain who had absolute control over all his constituents. Disobedience to his directives meant severe flogging of the culprit. After several years under the tyrannical rule of the chieftain, the people overthrew him and flogged their chieftain to death. The word ""basnutan"" means "flog" in the local dialect, and become a byword among the inhabitants, hence the name of the town. During the Spanish period, the name of the town was changed from "basnutan" to "Bacnotan" as shown by documents that are still kept intact at the National Archives in Manila.