Victor Emanuel had numerous children out of wedlock, by various mistresses in various parts of Italy. All were given the surname ‘Guerriero’ or ‘Guerrieri’. See ‘Parco fluviale del Po tratto torinese: Punti di Interesse’, Parks.it (Rome: Federazione Italiana Parchi e Riserve Natural).
For the baptism see ‘Rosa Vercellana’ in Wikipedia, L'enciclopedia libera, in the version current on 24 March 2009. The article cites as its main source Roberto Gervaso, La Bella Rosina, amore e ragion di stato in Casa Savoia (Milan: Bompiani 1991).
