Basilios 29 was bishop of Pisidia (presumably his see was the metropolis of Pisidia, Antioch); in 754 he presided over the iconoclast Council of Hieria together with the bishops of Ephesos and Perge, Theodosios 3 and Sisinnios 27: Mansi XII 1010 (ἧς ἐξῆρχε ... Βασίλειος Πισιδίας ὁ κακέμφατος τρικάκκαβος (sic) - he is mentioned in the proceedings at the Second Council of Nikaia). Basilios 29 is not mentioned in the account of the Council of Hieria in Theoph. AM 6245.

Together with Theodosios 3 and Sisinnios 27, Basilios 29 is said to have led astray the patriarch of Constantinople, Konstantinos 4: Mansi XII 1010. He was one of the iconoclasts anathematised by name at the seventh and eighth sessions of the Second Council of Nikaia: Mansi XIII 400 (Βασιλείῳ τῷ κακεμφάτῳ τρικακκάβῳ ἀνάθεμα), XIII 416. Under the name Trikakabos, he is included among the iconoclast leaders attacked by John of Damascus (Ioannes 11), in a speech attributed to Stephen the Younger (Stephanos 2): Vita Steph. Iun. 126.9 (1120A) (see Sisinnios 27).

As a leading ecclesiastical iconoclast he was one of the group sent by the emperor Constantine V (Konstantinos 7), probably in 762, to interview Stephen the Younger (Stephanos 2), then in custody in Chrysopolis: Vita Steph. Iun. 142.9 (1140B) (Βασιλείῳ τῷ Τρικακάβῳ), cf. 145.12 (1144C) (he questioned Stephanos 2 - τοῦ δὲ Τρικακάβου εἰπόντος). His nickname is clearly hostile; it means "three pots"; see also Auzépy, n. 201..

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