Kouropalates is a word that comes from the Greek language and it means "guardian of the palace".
So, let's imagine that we are in a big castle or palace, like the ones in the fairy tales that we love. The kouropalates was a person who had a very important job in this castle.
His job was to make sure that everything was safe and secure. He would watch over the castle and make sure that no bad guys were trying to sneak in. He would also make sure that all the doors and windows were locked tightly so that nobody could get in without permission.
The kouropalates was also responsible for making sure that everyone who came to the castle was allowed to be there. He would check their invitation and make sure they were on the guest list. If someone came who wasn't supposed to be there, he would send them away.
Sometimes, the kouropalates would have to go on special missions to protect the castle. He might have to go and find some treasure that had been stolen or fight off some scary monsters that were trying to attack.
Overall, the kouropalates was a very important person in the castle. He made sure that everyone inside was safe and that the castle was running smoothly.