ɪn spɹˈɪŋ ˈeɪthˈʌndɹɪd fˈɪfti sˈɪks, pˈaɪətɹoʊ ænd hɪz sˈʌn ænd kˈoʊɹˈiːdʒənt dʒəvˈɑːni hˈoʊstᵻd ˈɛmpɚɹɚ lˈuːi ɹˌoʊmən tˈuː ænd hɪz wˈaɪf ˈɛndʒɪlbɚɡə ɪn ɐ θɹˈiːdˈeɪ vˈɪzɪt tə vˈɛnɪs.
In Spring 856, Pietro and his son and co-regent Giovanni hosted Emperor Louis II and his wife Engelberga in a three-day visit to Venice.