Solera by the producers of sherry. In a Spanish sherry "solera", the vintner may transfer about a third of each barrel a year. A solera sherry has to be at least three years old when bottled. A quite similar process is called sostrera, used to produce fortified wines in the Mediterranean regions of France. In Sicily, where Marsala wine is made, the system is called "in perpetuum". Solera vinification is used in the making of Mavrodafni ("Black Laurel"), a fortified red dessert wine made in the Northern Peloponnese in Greece. Exceptional "Mavrodafni" vintages are released every 20 or 30 years: they
Rumney wine not a "fortified" wine in the modern sense, rather a "cooked" wine ("vin cuit") to which boiled-down must (grape syrup) was added. Rumney was exported from Methoni in the southern Peloponnese (one English source calls it "Rompney of Modonn") and perhaps also from Patras and other ports. Although modern methods are different, the Mavrodafni of Patras might be regarded as a modern equivalent of medieval Rumney wine. At the same period, Monemvasia, on the eastern coast of the Peloponnese, was the centre for the export of Malmsey wine; Cretan wine was the third of the medieval trio of Greek wines