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.
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