Xystus has several meanings:
Xystus, a Greek architectural term denoting the covered portico of a gymnasium Xystus, another spelling for the Roman name Sixtus Pope Xystus I Pope Xystus II Pope Xystus III Pope Xystus IV Xystus, a Greek student of Pythagoreanism, author of the Sentences of Sextus Xystus, a taxonomic synonym of Alloxysta, a genus of wasps Xystus (weevil), a genus of beetles in the tribe Apostasimerini
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