Ioannes 30 was bishop of Falerii (see below) in Tuscia; he was one of the hundred and twenty-five Western bishops who attended the Council of Rome at Easter 680, and who subscribed the decree condemning monotheletism: Riedinger II 2. 156, lines 34-36 (= Mansi XI 313-314) (Ἰωάννης ἐλάχιστος ἐπίσκοπος τῆς ἁγίας ἐκκλησίας Φαλάρεως ἐπαρχίας Τουσκίας; the old Latin version printed in Mansi calls him "Ioannes episcopus sanctae ecclesiae Salernitanae provinciae Tusciae". However, the old Latin version printed in Riedinger II 2. 157, line 27, calls his see "sanctae ecclesiae Phalaritanae"). He is named in a group of bishops from Tuscia, and therefore his see was not Salernum; the name most resembling Phalaris in Tuscia is Falerii, a town close to Nepet and Ameria whose bishops are listed on either side of Ioannes 30.

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