"Joachim Frederick of (Legnica-)Brieg (German: Joachim Friedrich von Liegnitz-Brieg; Polish: Joachim Fryderyk legnicko-brzeski; 29 September 1550 – Brzeg, 25 March 1602), was a Duke of Oława ...
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and Wołów (since 1586 with his brother as a co-ruler until 1592) and Brzeg (since 1595) and Legnica (since 1596).
He was the eldest son of George II the Pious, Duke of Brzeg-Oława-Wołów, by his wife Barbara, daughter of Joachim II Hector, Elector of Brandenburg. He was named after both grandfathers: Joachim II Hector and Frederick II of Legnica." - (en.wikipedia.org 30.01.2020)
