Io (voievodal title particle)

IO is like a special word that some people who ruled a long time ago would use to show that they were the boss or leader of a certain place. It was like a badge of honor or a special title that they would use to make sure everyone knew who was in charge. Kind of like when you wear a special badge to show that you are the line leader in your class. IO was only used by a few very important leaders and it was never used for regular people, so it was very special and powerful.