Short answers, pulled from the story.
Bartolommeo Berrecci (1480-1537) was an Italian Renaissance architect from Pontassieve, Italy, who spent most of his career in Poland. He is best known for designing the Sigismund Chapel at Wawel Castle in Kraków, considered the finest example of Italian Renaissance architecture outside Italy.
The Sigismund Chapel is a royal burial chapel at the Wawel in Kraków, built by Berrecci between 1517 and 1533 for King Sigismund I the Old of Poland. It served as the mausoleum for the last Jagiellonian rulers and is regarded as the most beautiful piece of Italian Renaissance architecture outside Italy.
Berrecci moved to Poland in 1516 at the invitation of bishop Jan Łaski. He was brought in to continue the rebuilding of the Wawel Royal Castle in Kraków after the death of the previous architect, Francesco Fiorentino, who had been commissioned by King Sigismund I of Poland after the castle burned down in 1499.
Berrecci was murdered in Kraków in 1537 by another jealous Italian artist. One account also links his death to an infection caused by a worksite accident during work on the tomb of Piotr Tomicki. He was buried in the Corpus Christi Basilica in Kazimierz by Kraków.
Berrecci's other works include the rebuilding of the Wawel Royal Castle, an extension of Niepołomice Castle, a baldachin for the tomb of Władysław II Jagiełło, tombs for bishops Jan Konarski and Piotr Tomicki in the Wawel Cathedral, and the tomb of Barbara Tarnowska in the Cathedral in Tarnów. He also likely worked on the Royal Palace of Lithuania in Vilnius.
Berrecci learned architecture in Florence, first through apprenticeship with his father, who was also an architect. He was then probably taught by Andrea Ferrucci, his father's fellow Florentine architect.