Bona Sforza(1493-1557), became the second wife of Sigismund I the Old, the King of Poland and Grand Duke of Lithuania, and became the Queen of Poland and Grand Duchess of Lithuania, in 1518.
She brought with her many Italians, others followed suit - cooks, gardeners, artists, architects ...
Here is for example a signed cameo, bearing the signature of Gian Giacomo Caraglio (1500/1505-1565). Best known as a printmaker, Caraglio who was born in Vienna and later worked in Venice and then Kraków, metmuseum.org/toah/works-of-art/17.190.869.
Italians in Poland, video: youtube.com/watch?v=XTC6aid47cs
Italy-Poland relations, wikipedia, en.wikipedia.org/wiki/Italy%E2%80%93Poland_relations
There are also several pages in category "Italians expatriates in Poland", devoted to Bernardo Bellotto, Michelangelo Palloni, Scipione Piattoli, Fausto Sozzini, en.wikipedia.org/wiki/Category:Italian_expatriates_in_Poland
Excerpts translated from a website of Italian Embassy in Warsaw:
In the fifteenth century, through contacts with various Italian universities, cooperation in cultural level clearly developed between the two countries: many Polish students, including Nicolaus Copernicus, completed their studies in Italy, while Italian teachers often came to Poland to educate children of the Polish nobility. Through such contacts, favorable to popularization of the idea of humanism and the Renaissance, the Italian influence on Polish art and culture lasted for over three centuries.
And since the nineteenth century, thanks to the contacts between patriots of both countries, gave a new momentum to mutual relations: between 1848 and 1849, many Polish soldiers conscripted into the ranks of Savoie troops, fought alongside Piemont soldiers in the first War of Independence. Many Poles also fought in defense of the Roman Republic, while others participated in the Expedition of the Thousand.
It is the common ideals of freedom and the brotherhood in arms, which have brought the two nations together in the struggle for national liberation against the domination of foreign powers. Even the famous poet Adam Mickiewicz fought for the independence of Italy, and garibaldini Francesco Nullo and Stanislao Becchi participated in the fighting on Polish soil.
Ancestry: List of Italian families naturalized or ennobled in Poland between 1500 and 1700:
If you want to search for surname "Data" the database "Italians in Poland" ancestry.com, you would need to sign in to Ancestry. You will receive 14 days free access to their resources.
It is possible to obtain specific number of surname Data in Piedmont, by using this search engine:
I just run it and here are quick results. Most of them live in Torino province:
46 in Forno Canavesse
26 in Torino
19 in Rivara
13 in Caselle Torinese
9 in Cirie
8 in Levone
7 in Nole