Many of the British monarchs were unable to manage their kingdoms because of porphyria, which can cause a variety of mental problems, like hallucination, paranoia, and anxiety.

• 许多英国的君主由于患卟啉病没法管理好他们的国家，因为这种病会导致许多精神异常表现，比如幻觉、妄想和焦虑。