Person · 790 CE – 855 CELeo IVAlso known asGiáo hoàng Leo IVGiáo hoàng Lêô IVGáu-huòng Leo 4-siéIV. LeoIV. Leó pápaKau-fòng Leo 4-sṳarchival plate · Leo IV · placeholderThis entry is a stub. The Library is awakening — a longer account is being written.Connected to9 links to entries not yet ingested in the Library.