As well as public buildings, many Dutch private homes have their own flagpole and fly the flag on ceremonial days. Strict protocol applies. The rules for public buildings are divided into ‘limited flag days’, such as royal birthdays, and ‘extended flag days’, like Liberation Day (May 5), when all public buildings fly the flag. On royal birthdays the custom is to fly the red, white and blue national flag alongside an orange pennant representing the House of Orange.