John I, Lord of Ligny

John I of Luxembourg, was a Lord of Ligny, Beauvoir, Roussy and La Roche from the House of Luxembourg. He was a son of Lord Waleran II and his wife, Guyotte of Lille. He was a 3rd generation descendant of Henry V, Count of Luxembourg.
Around 1330 John married Alix of Dampierre, the heiress of Guy of Dampierre-Richebourg. Their children were:

Marie, married in 1347 to Count Henry of Vaudémont
John, Lord of Roussy, and priest
Guy I, Count of Ligny and St. Pol
John, Bishop of Strasbourg from 1365 to 1369 and Archbishop of Mainz from 1371 to 1373
Johanna, married Count Guy V of Saint-Pol