Clement IPolycarpIgnatiusIrenaeusJustin MartyrCanonTertullianOrigenLate antiquity(313–476)Great Church(180–451)Romanstate church(380-451)Constantine the GreatChristianityArian controversyArchbasilica of Saint John LateranOld St. Peter's BasilicaFirst Council of NicaeaPope Sylvester IFirst Council of ConstantinopleBiblical canonJeromeVulgateCouncil of EphesusCouncil of ChalcedonEarly Middle AgesBenedict of NursiaMonasticismSecond Council of ConstantinoplePope Gregory IGregorian chantThird Council of ConstantinopleSaint BonifaceByzantine IconoclasmSecond Council of NicaeaCharlemagnePope Leo IIIFourth Council of ConstantinopleEast–West SchismHigh Middle AgesPope Urban IIInvestiture ControversyCrusadesUniversitiesScholasticismFirst Council of the LateranSecond Council of the LateranThird Council of the LateranPope Innocent IIILatin EmpireFrancis of AssisiFourth Council of the LateranInquisitionFirst Council of LyonSecond Council of LyonB