[1] In 1231 he was again ducal councillor under Doge Jacopo Tiepolo (also a former podestà) and witness to a treaty between Venice and the Latin Emperor, John of Brienne.
[1] Likely as a result of this, Tiepolo reappointed Zeno as Podestà of Constantinople, at the latest in spring 1235.
His request for naval aid from Venice was answered and proved crucial in the siege's failure.
[3] Zeno was also one of the principal agents in arranging a loan for John of Brienne, with the Crown of Thorns as a security deposit.
[4] Zeno likely remained in office until 1237,[4] and is finally attested as judge in Venice in 1243.