Grand Ma[i]gne (French for "Great Maina", in Greek: Μεγάλη Μαΐνη) or Vieux Ma[i]gne ("Old Maina", in Greek: Παλαιά Μαΐνη) was a Frankish castle in the Mani Peninsula, Greece.
1248–1250 AD by William II Villehardouin, the Prince of Achaea in order to control the Slavic tribe of the Melingoi, living on Mount Taygetos.
Another candidate is the settlement of Tigani, but although a sizeable medieval town it shows no traces of having been the site of a Crusader fortress.
Antoine Bon preferred the nearby site of Cavo Grosso (Cape Thyrides), known as Kastro tis Orias, where 19th-century travellers, including the French Expédition scientifique de Morée, mentioned the existence of fortifications, and which occupies a commanding position.
J. M. Wagstaff rejected this as, according to his research, there is no evidence that there ever was a fortification at Kastro tis Orias, and preferred to identify Grand Magne with the castle at Kelefa.