Portrait of Joachim II Hector (1505-1571), Elector of Brandenburg (1535-1571), 1562
Joachim II (German: Joachim II Hector or Hektor; 13 January 1505 – 3 January 1571) was a Prince-elector of the Margraviate of Brandenburg (1535–1571), the sixth member of the House of Hohenzollern. Joachim II was the eldest son of Joachim I Nestor, Elector of Brandenburg and his wife Elizabeth of Denmark, Norway, and Sweden. Joachim II was born in Cölln. His father, Joachim I Nestor, made Joachim Hector sign an inheritance contract in which he promised to remain Roman Catholic. This was intended in part to assist Joachim Nestor's younger brother, the Archbishop-Elector Albert of Mainz. Albert had borrowed huge amounts from the banking house of Fugger in order to pay the Holy See for his elevation to the Prince-Bishopric of Halberstadt and for a dispensation permitting him to hold both the Archbishopric of Magdeburg and Archbishopric of Mainz. Joachim Nestor, who had co-financed this accumulation of offices, agreed to let Albert recover these costs by the sale of indulgences to his subjects. Joachim's neighbor, Elector John Frederick I of Saxony, forbade the sale of indulgences, because Albert had outbid his candidate for the see of Mainz, but also on principle, being persuaded by his subject Martin Luther. Thus repayment of the debt to the Fugger depended on the sale of indulgences to Catholic believers in Brandenburg. However, had Joachim Hector not agreed to this, he would likely have been passed over in the line of inheritance. In 1535 he married Hedwig, daughter of King Sigismund I the Old of Poland. As the Jagiellon dynasty was Catholic, Joachim II promised Sigismund that he would not make Hedwig change her religious affiliation. With the deaths of his father Joachim Nestor (1535) and father-in-law Sigismund (1548), Joachim turned gradually to the Protestant Reformation. On 1 November 1539, he received Communion under both kinds in Spandau's St. Nicholas' Church, an act that indicated a degree of sympathy with the new religious ideas. However, Joachim did not explicitly adopt Lutheranism until 1555, to avoid open confrontation with his ally, Emperor Charles V. His wife Hedwig's mother Barbara Zápolya was a sister of John Zápolya, who had claimed the vacant throne of Hungary after King Louis II was killed in battle against the Ottoman Empire in 1526. However, Joachim supported Ferdinand of Habsburg, who also claimed the crown and challenged the Turkish invaders. In 1542 Joachim assisted Ferdinand against the Ottomans at the Siege of Buda (1541). He commanded an army of Austrian, Hungarian, German, Bohemian, Italian, and Dalmatian troops, but the Elector was not a seasoned warrior and eventually beat a retreat. He was defeated again by the Ottomans in the Siege of Pest in 1542. Joachim was a brother-in-law of King Sigismund II Augustus of Poland. In 1569, he paid Sigismund for a deed of enfeoffment which made Joachim and his issue heirs to Ducal Prussia in case of the extinction of the Prussian Hohenzollern line. In 1571, Joachim died in the Köpenick Palace, which he had built in 1558.
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