John I was married twice. His first marriage in 1333 was to Gertrude of
Merenberg (died 1350), daughter and heiress of Hartrad, the last Lord of Merenberg and
Gleiberg. Gertrude died on October 6, 1350, and was buried in Weilburg. The couple had one child, a daughter. She was engaged in 1340 with Reinhard II of Westerburg, but died shortly thereafter. John I's second marriage in 1353 was to Johanna of
Saarbrücken, Dame de
Commercy and heiress of Count
John II of Saarbrücken. This union produced seven children: • Johanna (1362–1383), married in
Kassel in 1377 to
Hermann II, Landgrave of Hesse (c. 1342 – June 10, 1413). Johanna died on January 1, 1383, in
Marburg and was buried. • John, and • Johannette (twins, died October 6, 1365). • Agnes (died 1401), married in 1382 to Count
Simon III Wecker of Zweibrücken-Bitsch. •
Philipp I of Nassau-Weilburg • Schonetta (died 25 April 1436), married: • on 30 June 1384 to
Henry X of Homburg; • in 1414 to
Otto II, Duke of Brunswick-Osterode. • Margarete (died 22 January 1427), married c. 1393 to Count
Frederick III of Veldenz. == Sources ==