Mary of Looz-Heinsberg | |
|---|---|
| Countess Consort of Nassau-Siegen | |
 Countess Mary of Nassau-Siegen, nee Lady of Looz-Heinsberg, detail of the epitaph in the Grote Kerk in Breda. Photo: Paul M.R. Maeyaert, 2011. | |
| Coat of arms |  |
| Full name | Mary of Looz-Heinsberg |
| Native name | Maria van Loon-Heinsberg |
| Born | 1424 |
| Died | 20 April 1502 |
| Buried | Grote Kerk, Breda |
| Noble family | House of Looz |
| Spouse(s) | John IV of Nassau-Siegen |
| Issue Detail | |
| Father | John II of Loon-Heinsberg |
| Mother | Anne of Solms |
Lady Mary of Looz-Heinsberg[note 1] (1424 – 20 April 1502), Dutch: Maria van Loon-Heinsberg, was a noble lady from the House of Looz and through marriage Countess of Nassau-Siegen.
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