Flag of Lucerne
The Flag of Lucerne is divided Horizontally into equal parts White and Blue. Luzern was a sovereign state within the Holy Roman Empire since 1241. Lucerne joined the Swiss Confederation in 1332. The first documented evidence of the blue-white flag is from 1386, and a seal of 1354 shows the blue-white arms divided vertically.
The vertical division of the coat of arms has been explained as due to a gonfalon type of banner used by Lucerne, hung from a horizontal crossbar, which was also used as a flagstaff so that the flag was turned by 90 degrees when carried in battle.