A bailo, also spelled baylo (plural baili / bailos) was a diplomat who oversaw the affairs of the Venetians in Constantinople, and was a permanent fixture in Constantinople around 1454.
The traumatic outcomes of Venice’s wars with the sultans made it clear to its rulers that in the Ottoman case the city would have to rely chiefly on diplomatic and political means rather than offensive military efforts to maintain and defend its position in the eastern Mediterranean. The bailo’s job was very extensive because he was both Venice’s political and foreign ambassador. He was very important in maintaining a good relationship between the Ottoman Sultan and the Venetian government. He was also there to represent and protect Venetian political interests. In Constantinople the bailo worked to solve any misunderstandings between the Ottomans and Venetians. To do this they established contacts and friendships with influential Ottomans and by doing this, they were able to protect their own interests. Unfortunately there were instances where there were difficulties finding replacements. This was often due to not enough qualified replacements, refusal to accept the position and the replacement dying before reaching Constantinople.
Like English , the Venetian word bailo derives from Latin , which originally meant "porter (carrier)". The Ottoman term was bālyōs or bālyoz.
Sometime between the fall of Constantinople in 1453 and the outbreak of the Second Ottoman–Venetian War in 1499, the baili relocated to the center of Galata. After another war the bailo relocated to one of Galata’s suburbs, to an embassy called Vigne di Pera. This house was used as a summer home and as a refuge from the plague. After the War of Cyprus, the embassy in Galata relocated to Vigne di Pera permanently. Most baili preferred this location over the one in Galata because it had less restrictions in after hour travel, and its location proved ideal in smuggling slaves.