Leonardo Navigajoso was a Venetian

Venice

Venice is a city in northern Italy which is renowned for the beauty of its setting, its architecture and its artworks. It is the capital of the Veneto region...

 nobleman and second Latin ruler of the island of Lemnos

Lemnos

Lemnos is an island of Greece in the northern part of the Aegean Sea. Administratively the island forms a separate municipality within the Lemnos peripheral unit, which is part of the North Aegean Periphery. The principal town of the island and seat of the municipality is Myrina...

 in Greece

Greece

Greece , officially the Hellenic Republic , and historically Hellas or the Republic of Greece in English, is a country in southeastern Europe....

.

Leonardo inherited the title of megadux of the Latin Empire

Latin Empire

The Latin Empire or Latin Empire of Constantinople is the name given by historians to the feudal Crusader state founded by the leaders of the Fourth Crusade on lands captured from the Byzantine Empire. It was established after the capture of Constantinople in 1204 and lasted until 1261...

 and the rule of one half of Lemnos upon the death of his father, Filocalo Navigajoso

Filocalo Navigajoso

Filocalo Navigajoso was a Venetian nobleman and first Latin ruler of the island of Lemnos in Greece....

, in 1214. His two sisters inherited one quarter of the island each, and passed them on to their sons. Leonardo had three sons, Paolo

Paolo Navigajoso

Paolo Navigajoso was a scion of the noble Venetian Navigajoso family and third Latin ruler of the island of Lemnos in Greece.Paolo was the eldest son and heir of Leonardo Navigajoso...

, who succeeded him, Filippo and Nicolao. All of them died in 1276–1277, when their capital of Kastro

Myrina, Greece

Myrina is a former municipality on the island of Lemnos, North Aegean, Greece. Since the 2011 local government reform it is part of the municipality Lemnos, of which it is a municipal unit. It covers the west coast of the island, and has a land area of 82.049 km², about 17.2% of the island's...

 was assailed by the Byzantines

Byzantine Empire

The Byzantine Empire was the Eastern Roman Empire during the periods of Late Antiquity and the Middle Ages, centred on the capital of Constantinople. Known simply as the Roman Empire or Romania to its inhabitants and neighbours, the Empire was the direct continuation of the Ancient Roman State...

 under Licario

Licario

Licario, called Ikarios by the Greek chroniclers, was a Byzantine admiral of Italian origin in the 13th century. At odds with the barons of his native Euboea, he entered the service of the Byzantine emperor Michael VIII Palaiologos , and reconquered many of the Aegean islands for him in the 1270s...

. Paolo's widow eventually surrendered Kastro and the rest of the island in 1278.