Author presumably a Buddhist; A. K. Warder (Warder 2004 p. 446-47) says: "the Pramāṇadvitvasiddhi [a lost work of Arcaṭa, Pramāṇadvitvasiddhi] . . . appears to be the same as the Pramāṇāntarbhāva . . .", but does not justify this assumption.
Time: ?, t.p. Dharmakīrti, Śrīharṣa (= Harṣavardhana, Pramāṇāntarbhāva 4,19).