[1] In 1386 Barbo accompanied Venetian diplomat Lorenzo de Monacis to Hungary representing Venice's interests during a crisis involving the succession to the Hungarian throne.
The two diplomats, having lost all their belongings during the incident, received 60 gold ducats as compensation by the Maggior Consiglio of Venice.
[4] Barbo participated in a diplomatic proposal by the Doge of Venice Antonio Venier involving giving the island of Tenedos to John V Palaiologos instead of destroying it according to the Venetian plan "factum ruynationis Tenedi".
The doge also wanted to keep the island as an aid to maritime navigation and argued that the Ottoman Turks could rebuild it even if the Venetians destroyed it.
In the aftermath of the diplomatic crisis, Barbo was sentenced on 17 April 1383 to "deprivation of all offices of state for ten years".