In 1547 and 1548 he was still listed as a tapestry maker for the court of Charles V. Around 1550 van Aelst was commissioned by the Polish king Sigismund II Augustus to make a large and lavish work consisting of 18 tapestries representing various episodes in the book of Genesis.https://en.wikipedia.org/wiki/Pieter_van_Aelst_III
Sigismund Augustus was the last male member of the Jagiellonian dynasty. The death of his childless sister, Anna, in 1596 marked the end of the dynasty. In addition to his family connections, Sigismund II Augustus was allied to the Habsburgs as member of the Order of the Golden Fleece. Reign
The tapestries had been displayed publicly for the first time during the wedding of king Sigismund Augustus with Catherine of Austria. To this day, preserved about 138 of which exposed are about 30. They were matched in size to the walls and some of them reach the size of 5 × 9 m (5.47 × 9.84 yd). 
The first known source in which the tapestries of Sigismund Augustus are described is a panegyric by Orzechowski, a student of the universities of Padua, Bologna and Rome, Panagyricus nuptiarum Sigismundi Augusti Poloniae Regis, dedicated to the wedding of Sigismund Augustus and his third wife, Catherine of Austria, the daughter of Holy Roman ...
In 1547 and 1548 he was still listed as a tapestry maker for the court of Charles V. Around 1550 van Aelst was commissioned by the Polish king Sigismund II Augustus to make a large and lavish work consisting of 18 tapestries representing various episodes in the book of Genesis.
The core collection – the Flemish tapestries of Sigismund II Augustus looted by Russia in the 18th century – was restituted after 1921 on the power of the Treaty of Riga. Shortly after the outbreak of World War II, the Poles succeeded in evacuating the most valuable objects, including the tapestries and the coronation sword “Szczerbiec ...
Sigismund II Augustus; King of Poland Grand Duke of Lithuania; Reign: 1 April 1548 – 7 July 1572: Predecessor: Sigismund I the Old: Successor: Henry III (in 1573)
The Tapestry Collection of Sigismund II Augustus. Commissioned by Sigismund II Augustus (r. 1548–1572), the tapestries were woven in 1550–1560 in Brussels, then the leading center for European tapestry production. It was the largest group of tapestries ever executed as a single commission and remains one of the most significant collections of its kind in the world.
name=Sigismund II Augustus image_caption= birthdate=birth date|1520|8|1|df=y birthplace= Kraków ...
Sigismund II Augustus (Zygmunt II August, Ruthenian: Żygimont II Awgust, Žygimantas II Augustas, Sigismund II.) (1 August 1520 – 7 July 1572) was the King of Poland and Grand Duke of Lithuania, the only son of Sigismund I the Old, whom Sigismund II succeeded in 1548. 107 relations.
Sigismund's Chapel: Tomb of the chapel's founder, Sigismund I the Old, and his son, Sigismund II Augustus. In 1517, the 16-year-long construction of another chapel adjoining the cathedral began. Sigismund's Chapel ( Kaplica Zygmuntowska ) was to serve as the mausoleum of the last members of the Jagiellonian dynasty .