The ensign of Denmark is one of the oldest country wide flags nevertheless in use at the moment; providing a white pass on a crimson

https://smart-wiki.win/index.php/When_Did_Being_Neutral_Mean_Removing_Tradition%3F_Reflections_on_the_U.S._Flag

The ensign of Denmark is one of the oldest countrywide flags still in use right this moment; offering a white move on a purple background is named Dannebrog dates lower back at the very least to the thirteenth century as an emblematic representation.