He re-appears in 1278–79, leading another campaign against Bulgaria, where a successful revolt against Tsar Constantine Tikh had placed Ivaylo on the throne. Upon hearing this, Emperor Michael VIII sent Glabas at the head of an army to put the exiled prince Ivan Asen III on the Bulgarian throne. Glabas managed to capture the Bulgarian capital, Tarnovo, where he seized Ivaylo's Byzantine wife, Maria, and their son Michael. He then pursued Ivaylo to the fortress of Silistra, which he besieged but failed to take. Eventually, however, with aid from Nogai Khan, Ivaylo managed to defeat and drive back the Byzantines. In 1282, the Serbs invaded Byzantine territory in northern Macedonia, and the new emperor, Andronikos II Palaiologos (), sent Glabas against them with 4,000 Tartar auxiliaries. Although the Tartars raided Serbia, the Serbs were still able to conquer much of northern Macedonia, including Skopje.