He was appointed Titular archbishop of Thessalonica on 18 December 1711, and shortly after consecrated bishop in Rome by Cardinal Fabrizio Paolucci.
His portion of the Roman road began at the Adriatic Sea, crossed the Pindus mountains and travelled eastward into central Macedonia, ending at Thessalonica.
John Komnenos Doukas (died 1244), ruler of Thessalonica in 1237–1244, referred to as John Angelos in earlier literature
The nature and sparsity of these references demonstrate the effective loss of any political power by the clan: a Stephen Maleinos was a landowner near Thessalonica in 1084, and another Maleinos, who rebelled against Emperor Andronikos I Komnenos (r. 1183–1185) in 1185, is described by Niketas Choniates as neither of noble birth nor rich.
In the 1080s the general Nikephoros Melissenos, after launching a rebellion against Nikephoros III Botaneiates (r. 1078–1081), accommodated himself with Botaneiates' successor, Alexios I Komnenos (r. 1081–1118), whose sister Eudokia he had married, in exchange for the title of Caesar and estates near Thessalonica.
Oberto went to Negroponte and plotted against the emperor, but Ravano dalle Carceri, lord of that island and a former confederate of Biandrate, protected the emperor and Oberto quickly surrendered and returned to Montferrat, where he sought to convince William to claim Thessalonica.
Thessaloniki, Greece's second-largest city, named after Thessalonica of Macedon