Marco Venier was a Marquess of Cerigo.
[1] He was Venetian and won his Marquisate as a result of the Fourth Crusade.
He married ... and had Bartolommeo Venier, fl.
between 1252 and 1275,[1] who married ... and had Marco Venier, Lord of Cerigo.
[1] This article about Greek history is a stub.