1413–1436 Louis II, grandson of Louis I the Fair, also Duke of Brzeg since 1399
From this union, Henry IX gained two half-siblings: Louis II and Margareta.
In February 1445 John I married Hedwig (b. ca. 1433 – d. 21 October 1471), daughter of Duke Louis II of Brieg.
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John I and Henry X were the legitimate heirs of that land, as grandsons of Duke Henry IX of Lüben, elder brother of Duke Louis II, Elisabeth's late husband, who left her Liegnitz and Brieg (already give by the Dowager Duchess to both brothers in 1443) in 1436; in addition, John I had another claim over Liegnitz through his marriage with Hedwig, youngest daughter of Louis II and Elisabeth.
Initially, seeing no chances of victory, Duke Louis II of Brieg entered into an arrangement with John, under which he was compelled to not interfere with the movements of enemy troops.
Sigismund rewarded Sigismund by transferring the rights to Krnov back to John II, who had to redeem Krnov from Duke Louis II of Brieg.
On 12 January 1409, after the death of his last surviving brother Rupert I without male issue, Wenceslaus II became in the sole heir of the Duchy of Legnica; two months later, on 19 March, he designated as his heirs the brothers Henry IX and Louis II of Brieg, grandsons of Louis I the Fair.
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