ðɪ ɪlədʒˈɪɾᵻmət sˈʌn ʌv kɔstˈænzoʊ aɪ ˈɛsfˈɔːɹzə, hiː wʌzɐ mˈɛmbɚɹ ʌvðə pˈaʊɚfəl hˈaʊs ʌv ˈɛsfˈɔːɹzə, ɪnðə lˈaɪn ʌv pɛsˈæɹoʊ ænd ɡɹeɪdˈɑːɹɹə ðə mˌɪlənˈiːz lˈaɪn hˈɛld ðə dˈʌtʃi ʌv mɪlˈæn æt ðə tˈaɪm.
The illegitimate son of Costanzo I Sforza, he was a member of the powerful House of Sforza, in the line of Pesaro and Gradara (the Milanese line held the Duchy of Milan at the time).