Hou (title)

Hou () was a title for an ancient Chinese ruler, equivalent to King/Queen or Emperor/Empress. 
The Chinese character "Hou" (后) is an ideogrammic compounds, in oracle bone script it is written the same as "Si" (司, means "to rule") as the combination of mouth (口) and hand (手). Hou usually refers to female rulers in oracle bone script. In Xia Dynasty, the title for Kings of Xia were "Hou", for example the expression "Xia Hou Shi" (夏后氏) means King of Xia, and the contemporary leader Houyi. Kings of Shang Dynasty had their own title "Wang", and "Hou" turned to refer to the Queen, "the" wife of the King. This may reflect the fact that rulers were female in ancient times.