Constantine Kastrioti was an Albanian

Albanians

Albanians are a nation and ethnic group native to Albania and neighbouring countries. They speak the Albanian language. More than half of all Albanians live in Albania and Kosovo...

 nobleman and a commander of the League of Lezhë

League of Lezhë

The League of Lezhë was an alliance of Albanian Principalities forged in Lezhë on the 2nd of March 1444. It was initiated and organised by Skanderbeg with the aim of uniting the Albanian principalities that had been founded in the 12th - 14th centuries, to fight the Ottoman Armies...

. A member of the Kastrioti family he was Skanderbeg

Skanderbeg

George Kastrioti Skanderbeg or Gjergj Kastrioti Skënderbeu , widely known as Skanderbeg , was a 15th-century Albanian lord. He was appointed as the governor of the Sanjak of Dibra by the Ottomans in 1440...

's nephew, while his father's name is unknown.
During Skanderbeg's Italian expedition

Skanderbeg's Italian expedition

Skanderbeg's Italian expedition was undertaken to aid his ally Ferdinand I of Naples, whose rulership was threatened by the Angevin Dynasty. George Kastrioti Skanderbeg was the ruler of Albania who had been leading a rebellion against the Ottoman Empire since 1443 and allied himself with several...

 at the age of twenty-two or twenty-three he was sent to Italy to command a contingent of troops in order to help Ferdinand I of Naples

Ferdinand I of Naples

Ferdinand I , also called Don Ferrante, was the King of Naples from 1458 to 1494. He was the natural son of Alfonso V of Aragon by Giraldona Carlino.-Biography:...

 maintain his rule against the Angevins

House of Valois-Anjou

The Valois House of Anjou, or the Younger House of Anjou, was a noble French family, deriving from the royal family, the House of Valois. They were monarchs of Naples, as well as various other territories....

 and their allies.

Since Skanderbeg was busy with internal affairs in Albania

Albania

Albania , officially known as the Republic of Albania , is a country in Southeastern Europe, in the Balkans region. It is bordered by Montenegro to the northwest, Kosovo to the northeast, the Republic of Macedonia to the east and Greece to the south and southeast. It has a coast on the Adriatic Sea...

, Constantine played a leading role in the Albanian expedition before his uncle's arrival. He served under Ferdinand who had been trying to regain his territory after it had been overrun by the Angevins and their supporters.

Along with Constantine's cavalry, Francesco del Balzo, the Duke of Andria who had remained loyal to Ferdinand, managed to defeat Ercole d'Este, one of the pro-Angevin nobles in Gargano

Gargano

Gargano is a historical and geographical Italian sub-region situated in Apulia, consisting of a wide isolated mountain massif made of highland and several peaks and forming the backbone of the Gargano Promontory projecting into the Adriatic Sea. The high point is Monte Calvo at . Most of the upland...

. From Gargano, they were then able to collect customs-duties of 30,000 ducats. Constantine and Ferdinand were able to regain some lost territory before Skanderbeg landed in Italy and took over the command.