Strictly a footnote to those 18 emperors et al......
"For the ancient Irish, sucking the king’s nipples was a way of showing submission."
www.listverse.com/2017/01/28/10-ancient-bog-bodies-that-will-amaze-you 99.999% of people who read it will think it's ridiculous, meaningless nonsense. A few will see it for what it is, IMHO -- state homoeroticism.