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Karl Hopf (Hamm, Westphalia, February 19, 1832 – Wiesbaden, August 23, 1873) or Carl Hermann Friedrich Johann Hopf was historian and expert in Medieval Greece, both Byzantine and Frankish.
According to "The Latins in the Levant. A History of Frankish Greece (1204–1566)" by William Miller, the seven brothers may also have had a sister, the wife of Marco I Sanudo and mother of Angelo Sanudo.