Marco Barbarigo di Croia

Marco Barbarigo (fl. 1388–d. 1428) was a Venetian nobleman, who married Helena Thopia and thus inherited the rule of Croia (Krujë) (in modern Albania), which he initially held under Venetian and later, after quarrelling with Venetian noblemen, Ottoman suzerainty, until in late 1394 when he was defeated by Venetian subject Niketa Thopia (his wife's cousin) and forced into exile at the court of Đurađ II Balšić. He was appointed the Venetian governor (as "count" or "captain") of Cattaro (Kotor) in ca. 1422.

Barbarigo was a Venetian businessman. He married Helena Thopia, the daughter of Albanian magnate Karl Topia, who had ruled as "Prince of Albania" from Durazzo and had since 1386 served as a Venetian vassal. After Karl's death in 1388, Barbarigo inherited the castle of Croia and the surrounding region through his wife. He ruled from the strong fortress of Croia and held the possessions under Venetian suzerainty.

After the Ottomans had occupied Scutari (by early 1393), they defeated Demetrius Jonima, who then set up a meeting between Barbarigo and the Ottomans. As Barbarigo had recently quarrelled with the Venetians, and likely felt an Ottoman threat, he accepted Ottoman suzerainty. He had a meeting with Beyazid. He retained Croia and his lands which stretched to Durazzo, and began to plunder Venetian holdings in the vicinity of Durazzo. Venice ordered Niketa Thopia, the governor of Durazzo, to answer the plundering; Thopia heavily defeated Barbarigo. The Ottomans, presumably disappointed, installed their vassal Konstantin Balšić as governor of Croia; Barbarigo was exiled, taking refuge at the court of Đurađ II Balšić, who at the time was also an Ottoman subject. Konstantin soon married Barbarigo's wife Helena, who had the hereditary rights to Croia. In chronicles, Helena is said to have been unfaithful, transferring Croia to her lover, Konstantin. Đurađ II had declined an offer of 1,000 ducats to give up Barbarigo to the Venetians. Afterwards, Đurađ II broke ties with the Ottomans and seized rival Konstantin's stronghold Dagno in 1395, with Venetian assistance.