“for more than 500 years, anyone who wanted a Master of Arts degree from Oxford had to take an oath promising they would never “agree to the reconciliation of Henry Symeonis” (this was in Latin, so quod numquam consencient in reconciliationem Henrici Symeonis). The requirement was added to the university statutes in 1264, and wasn’t removed until 1827—more than half a millennium later. The good part is that for most of that enormous span of time, nobody had any idea who Henry Symeonis actually was or what he might have done”