Two modern groups of people looking different does not necessarily prove a lack of common ancestry. The people of the past in a certain place did not necessaril

Two modern groups of people looking different does not necessarily prove a lack of common ancestry. The people of the past in a certain place did not necessarily look like the people of the present in that same place. In particular, the reason why modern English are not really descended from ancient Romans is because the people who were (at least partially; they were known as Romano-British) got displaced by larger numbers of other people, principally Norse and Germanic peoples from the continent (especially Anglo-Saxons and Normans). Moreover, the history of Italy is quite different in the specifics but actually has some similarities in the broad strokes. Germanic peoples from the north, Norse peoples from the sea, and (more uniquely) North African peoples from the south, have all through migration, displacement, and interrelations shaped the ancestry of modern Italians.