Family: Gerard I van Hoorne / Irmgard of Cleves (F500913)
m. Ongeveer 1311Dietrich VIII of Cleves (1256-1305) 
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Margaretha van Habsburg (1270-1305)
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Adelheid of Cleves (1290-1320)  |
| Diederik IX of Cleves, Count of Cleves (1291-1346) |
| Agnes of Cleves (1295-1360) |
| Johan of Cleves (1295-1368) |
| Gerard I van Hoorne (1270-1330)
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| Irmgard of Cleves (1290-1351)
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| Dirck Thierry van Horne (1320-1378) |