Lanfranchi is typical of Lombardy and upper Emilia, with a strain also in the Florentine, Lanfranchini, very very rare, it would seem specific of the Vercelli, of the area of Valduggia and Borgosesia, Lanfranco is specific of central-western Piedmont, derive, directly or through hypocoristic, from the name medieval of Germanic origin Lanfrancus, of which there are traces for example in Modena in 1000 with the architect Lanfrancus who built the Cathedral of Modena between 1099 and 1106, in 1130 among the Capitanei of Milan it is cited Lanfrancus Ferrarius, in the Diplomatic Code Brescia is preserved an act of 1147 written by: "Ego Lanfrancus notarius sacri palaccii rogatus scribere unc breve scripsi et interfui." and, an act of 1185 written by: "... Ego Lanfrancus Mazaperlinus notarius interfui et rogatus scripsi.".
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