Tribuno Memmo was the 25th Doge of Venice

Doge of Venice

The Doge of Venice , often mistranslated Duke was the chief magistrate and leader of the Most Serene Republic of Venice for over a thousand years. Doges of Venice were elected for life by the city-state's aristocracy. Commonly the person selected as Doge was the shrewdest elder in the city...

 who served from 979 to 991. He was illiterate and according to preserved documents, he signed via signum manus.

He was rich, partly due to marriage to Marina, daughter of the 22nd Doge Pietro IV Candiano

Pietro IV Candiano

Pietro IV Candiano was the twenty-second or twentieth Doge of Venice from 959 to his death. He was the eldest son of Pietro III Candiano, with whom he co-reigned and whom he was elected to succeed.-Rise:...

. They had a son, Maurizio.

It seems that he had only moved into the Ducal Palace toward the end of his dogeship. It was still in repairs following the fire which occurred during the deposal of Pietro IV Candiano. During his dogeship, St Mark's Basilica

St Mark's Basilica

The Patriarchal Cathedral Basilica of Saint Mark is the cathedral church of the Roman Catholic Archdiocese of Venice, northern Italy. It is the most famous of the city's churches and one of the best known examples of Byzantine architecture...

 became by decree a ducal property, a sort of private chapel in which the ecclesiastical functions were delegated to the primicerius. On June 7, 983, Emperor Otto II

Otto II, Holy Roman Emperor

Otto II , called the Red, was the third ruler of the Saxon or Ottonian dynasty, the son of Otto the Great and Adelaide of Italy.-Early years and co-ruler with Otto I:...

 renewed the commercial privileges that had already been enjoyed by many previous Doges.

He died in 991 and was succeeded by Pietro II Orseolo

Pietro II Orseolo

Pietro II Orseolo was the Doge of Venice from 991 to 1009.He began the period of eastern expansion of Venice that lasted for the better part of 500 years...

.