One of the leaders of the Grand Heathen Army that fucked up the Anglo-Saxon heptarchy was a dude called Ivar the Boneless. There’s all kinds of theories about why he was called that–he was double-jointed, had erectile dysfunction, had osteoporosis, so on and so forth. Some have even postulated that he was given the Latin title “Exosus,” and this was misrendered as “ex os,” literally, “Without Bones.” But of course nobody knows for sure and we probably never will.
The greatest and best explanation, of course, comes from Ragnar Lodbrok’s Saga, where it just straight-up says, “Ragnar’s son Ivar was called ‘the Boneless’ because he had no bones.”
Mules are an interesting mostly forgotten little thing
Fun fact: There was an ongoing Wikipedia editing dispute from 2009-2010 about whether the sentence “After World War II, mules fell on hard times” should remain in the “Mule” article.