Rao has a strain in the province of Rome, one in the Caserta and a large nucleus in Sicily and Calabria, Rau has a strain in Sassarese, between Tempio Pausania and Berchidda, a stump in Paternò in Catania and one between the province of Rome and that of L'Aquila , could result from a contraction of the Latin name Raulus truncated form of Raulandus. The Rau are mentioned among the noble families of Sicily.
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