Hieronymus Landus (dates uncertain, probably died in 1479) was an archbishop of Crete

Crete

Crete is the largest and most populous of the Greek islands, the fifth largest island in the Mediterranean Sea, and one of the thirteen administrative regions of Greece. It forms a significant part of the economy and cultural heritage of Greece while retaining its own local cultural traits...

. Although he was not technically a papal nuncio, in 1459 Landus became one of the first papal delegates to Poland. He was sent on a diplomatic mission to Kraków

Kraków

Kraków also Krakow, or Cracow , is the second largest and one of the oldest cities in Poland. Situated on the Vistula River in the Lesser Poland region, the city dates back to the 7th century. Kraków has traditionally been one of the leading centres of Polish academic, cultural, and artistic life...

 by Pope Pius II

Pope Pius II

Pope Pius II, born Enea Silvio Piccolomini was Pope from August 19, 1458 until his death in 1464. Pius II was born at Corsignano in the Sienese territory of a noble but decayed family...

 to try to end the Thirteen Years' War (1454-66) between the Kingdom of Poland

Kingdom of Poland (1385–1569)

The Kingdom of Poland of the Jagiellons was the Polish state created by the accession of Jogaila , Grand Duke of Lithuania, to the Polish throne in 1386. The Union of Krewo or Krėva Act, united Poland and Lithuania under the rule of a single monarch...

 allied with the Prussian Confederation

Prussian Confederation

The Prussian Confederation was an organization formed in 1440 by a group of 53 gentry and clergy and 19 cities in Prussia to oppose the monastic state of the Teutonic Knights. It was based on the basis of an earlier similar organization, the Lizard Union...

, and the Order of the Teutonic Knights. Landus hoped to garner support from Casimir IV

Casimir IV Jagiellon

Casimir IV KG of the House of Jagiellon was Grand Duke of Lithuania from 1440, and King of Poland from 1447, until his death.Casimir was the second son of King Władysław II Jagiełło , and the younger brother of Władysław III of Varna....

 against the Ottomans who had captured Constantinople in 1453. However, the war against the Teutonic Knights continued for another seven years, and Constantinople remained in Turkish hands.

Nevertheless, the Holy See

Holy See

The Holy See is the episcopal jurisdiction of the Catholic Church in Rome, in which its Bishop is commonly known as the Pope. It is the preeminent episcopal see of the Catholic Church, forming the central government of the Church. As such, diplomatically, and in other spheres the Holy See acts and...

 continued to send papal legates, and the first permanent Apostolic Nuncio in Poland was Bishop Luigi Lippomano

Luigi Lippomano

Luigi Lippomano was an Italian cardinal and hagiographer.- Life :Illegitimate son of a Venetian patrician, Lippomano was destined for an ecclesiastical career. He studied at Padua and eventually entered into service at the papal court in Rome...

, appointed in 1555 by Pope Julius III

Pope Julius III

Pope Julius III , born Giovanni Maria Ciocchi del Monte, was Pope from 7 February 1550 to 1555....

 and sent to the Polish by Pope Paul IV

Pope Paul IV

Pope Paul IV, C.R. , né Giovanni Pietro Carafa, was Pope from 23 May 1555 until his death.-Early life:Giovanni Pietro Carafa was born in Capriglia Irpina, near Avellino, into a prominent noble family of Naples...

.

Landus was titular Latin Patriarch of Constantinople

Latin Patriarch of Constantinople

The Latin Patriarch of Constantinople was an office established as a result of Crusader activity in the Near East. The title should not be confused with that of the Patriarch of Constantinople, an office which existed before and after....

from 1474-c.1496.