His father was Łaszcz z Gosławic from, the Konin castellan - performing the function of a subordinate lądzko-Koniń, and his mother Dorota. He began his education in Brodnica, then in 1379 he studied at the Charles University in Prague, where before 1392 he obtained the title of a bachelor in the field of decrees, however he graduated in 1393. He then went to the University of Padua, where he obtained the same field in 1405. PhD title. Already in 1392 he became a provost of Włocławek and held this office until 1414. Also in 1392 he began his diplomatic career by serving the great master of the Teutonic KnightsKonrad von Wallenrode. In 1397 he became the chancellor of Queen Jadwiga, and a year later the Włocławek Chapter wanted to be elected a bishop, but Andrzej himself abandoned the throne supported by King Mikolaj Kurowski. Before 1402 he became a canon of Płock, and in 1405 he was the chaplain of the German King Ruprecht Wittelsbach. In 1409 he became a papal collector in Poland and also took part, together with his relatives, the Poznań bishop Piotr Wysz, in the Council in Pisa and pilgrimage to the Holy Land. In 1411, together with Jakub Śledz, he sent John XXIII to the anti pope-John Paul II, complaining to him about the Teutonic Knights breaking the First Peace of Toruń. His spiritual career was also developing. Already in 1413 he was the dean of Kracow Cathedral, the canon of Gniezno and Poznań. A year later he became a papal protector and bishop of Poznań. In the meantime, from 1412 to 1414 on behalf of Władysław Jagiełło he appeared as a prosecutor in the trial between Poland and the Teutonic Order and then went as a member of the official Polish delegation to the Council of Constance, where he mainly participated in the work of the commission for faith and in the trials between Poland and the Teutonic Knights. He also became known there as a supporter of church reform and conciliarist. In 1419 he was in the procession of the king during his congress with the emperor in Nowy Sącz, and in 1420 he was in the legation to the Diet of the Reich, which took place in Wrocław, during which the emperor considered Polish-Teutonic disputes. In the same year he took part in a synod called by Mikołaj Trąb to Wieluń. In 1422, he again took part in the trial with the Teutonic Knights, appearing as a witness this time, and in 1423 he took part in the Council in Pavia. In 1424, together with Paweł Włodkowic, he sent to Rome, where they repudiated the charges against the Pope. During this stay, he also resigned from the episcopal throne, which, however, was not accepted. From the bull of Pope Martin V of 1424, we learn that he and his nephew Jan of Licheń were the founder of the new church in Gosławice.
Memorials
In this church there is a very interesting team of 26 coats of arms placed on stone supports supporting the ribs of the church's vault. On the column supporting the vault, the Godziemba coat of arms is placed, which was donated by the founders (this coat of arms is still four times; Marcin z Słupca, living in the 15th century, wrote a Latin poem entitled "Epitaph in honor of Andrzej Łaskarz". One of the streets of Poznań near the cathedral was given the name Andrzej Łaskarz.
