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'''Monarchy''' is a system of [[government]] in which one person reigns,<ref name="m=w.com">https://www.merriam-webster.com/dictionary/monarchy</ref> which is a form of hereditary [[autocracy]].<ref>https://www.merriam-webster.com/dictionary/autocracy</ref> The ruler of a monarchy, known as a [[monarch]], is usually a [[king]] or [[queen]], but may hold a different title such as [[emperor]] or grand duke. The monarch is often only the [[head of state]], not the head of government. Most modern monarchies, such as [[Britain]] and [[Denmark]], are actually governed by [[parliament]]s, and are termed "[[Constitution]]al Monarchies." The term "monarch" comes from two [[Greek]] words (monos, "one, singular", and árkhō, "to rule"), meaning "to rule alone."