FOUND SOMETHING:

"In ancient Mesopotamia, a lunar eclipse was considered a direct attack on the king. Given their ability to predict an eclipse with reasonable accuracy, they would put in place a proxy king for its duration. Someone that was considered to be expendable would pose as the king, while the real king would go into hiding until the eclipse passed. The proxy would go away and then the real king would come out of hiding."

source: https://awarenessact.com/the-blood-moon-prophecy-and-the-history-behind-it/