GIOVANNI, DAFFERIO. — Cardinal, active in the first half of the 12th century. Born of a noble family in Salerno, he was created cardinal deacon of the title of S. Nicola al Carcere Tulliano by Callistus II in 1120.
He took part in the election of Honorius II, and at the latter’s death (13 February 1130) he is found among the schismatic cardinals who elected the antipope Anacletus II (Pierleoni). The latter transferred him to the presbyteral title of S. Pudentiana. Upon his return to the unity of the Church, Innocent II, by bulls of 1133 and 1134, restored him to his original title, and again in March 1134 to that of S. Pudentiana, which he probably held until the following year.
BIBL.: F. M. Brixius, Die Mitglieder des Kardinalskollegiums von 1130-81, Berlin 1912, pp. 35 and 77-78; F. F. Palumbo, Lo scisma del 1130, Rome 1942, pp. 210, 260, 297.