They were also joined by families from northern Italy, in some cases related to the Aleramici dynasty of the Marchesi di Monferrato and Marchesi del Vasto e Saluzzo, who arrived in southern Italy as a result of dynastic marriages into the ruling family of the Norman counts of Apulia and Sicily, or as adventurers.
Just over 100 years after the Catalogus was written, Charles I King of Sicily [Anjou-Capet] compiled a "Book of Fees" which lists properties which had been confiscated from the supporters of his predecessor, King Manfredo, and were restored to their previous owners by the new regime.
I am grateful to Paolo Rossi's work in helping to establish the geographical allocation of these counties The present-day Italian region of Basilicata is located north of Calabria and the south of Puglia [Apulia].
The only medieval counties so far identified with this area are Marsico, Policastro, Sanseverino and Tricarico, as well as the Signoria di Chiaromonte.
The Catalogus records fiefholders in the following named duchies, counties and principalities within the Sicilian kingdom: "ducatus Apuliterr Baricomitatus Gravincomitatus Andricomitatu Cupersaniprincipatu Tarenticomitatus Montis Caveosicomitatus Liciicomitatus Civitatiscomitatu Loritellicomitatus Casertcomitatus Fundanus Domini di Aquinocomitatu Simonis comitis de Sangro".
Other counties which were known before the mid-12th century are also referred to by name, but not as counties, for example Avellino, Marsico and Aversa.