Agnello Participazio

Agnello Participazio (Latin: Agnellus Particiacus) was the tenth traditional and eighth (historical) doge of the Duchy of Venetia from 811 to 827. He was born to a rich merchant family from Heraclea and was one of the earliest settlers in the Rivoalto group of islands. His family had provided a number of tribuni militum of Rivoalto. He owned property near the Church of Santi Apostoli. A building in the nearby Campiello del Cason was the residence of the tribunes. Agnello was married to the dogaressa Elena.

The name Agnello appeared in the earliest documents (819 and 820) and in John the Deacon's chronicle Historia Veneticorum. It appeared as Angelo in a document datable to 1023. The surname is attested only later, in John the Deacon's chronicle, who attributed it only to Orso II Participazio (911-932). Its attribution to the whole household and to the prior Participazio doges (Agnello Giustiniano (827–829), Giovanni I (829–836), Orso I (864–881) and Giovanni II (881–887) was established by 19th century scholars.

According to some historians Agnello was elected, while others say that he was appointed by Arsaphios, a Byzantine envoy.