She was the daughter of Rambaldo VI di Collalto, count of Treviso, and his wife Giovanna, from the Mantuan House of Monte Sant'Angelo.
She was born in the family seat of the House of Collalto in the town of the same name.
[1] She became a nun at a young age and met Beatrice I d'Este in the Santa Margherita Convent on mount Salarola (Calaone).
She moved to the convent on the Giudecca in Venice where she rebuilt the church of San Cataldo with its monastic annex and became its abbess.
A church dedicated to the blessed Giuliana can be found in Brtnice, Czech Rep. on the former fideicommissum property of the Collalto house in Bohemia.