Merlone, Rinaldo (1983). "Prosopografica aleramica (secolo X e prima metà del XI)". Bollettino storico-bibliografico subalpino. 81: 451–586. He arranged to have built a monastery in loco et fundo Spignni ad locum hubi monte Sancti Quintini dicitur in onore Domini Dei Salvatoris, Sanctique Thome apostoli et beati martiris Christi Quintini. Spigno lies between Acqui and Savona, at the confluence of the Valla and the Bormida. Otto's family finished his project pro salute illius anime nostrorumque atque omnium fidelium ("for the health of his soul and ours with all faith"). The monastery also replaced that of Giusvalla, destroyed by the Saracens.
