A History of Frankish Greece (1204-1566) (1908) by William Miller, his mother was "a French dame of high degree", daughter of Macaire de Saint-Ménéhould. In 1262, his mother reportedly welcomed Baldwin II of Courtenay who was attempting to reclaim the throne of the Latin Empire.
Marco was the eldest son and successor of Angelo Sanudo. According to The Latins in the Levant. According to Miller, Marco II"s maternal grandmother was "Laskaraina", a woman of the Laskaris family.
Miller identified her as a sister of Constantine Laskaris and Theodore I Laskaris.
He based this theory on his own interpretation of Italian chronicles.
