Gerard I of Horne

Gerard I van Horne (1270–1331) was a nobleman of the House of Horne, son of William II. He held several lordships, buying Herlaar in 1315. In 1302 he married Johanna of Leuven-Gaasbeek, who bore his heir William IV in 1305; after her death he married Irmgard of Cleves in 1316, by whom he had Dirk.

In 1318 he hosted the nobles mediating between the count of Holland and the duke of Brabant over the Land of Heusden. He was buried in the Carmelite church in Brussels.