Diederik of Heinsberg (French: Thierry, German: Dietrich, English: Theodoric) (died between 17 and 21 January 1361) was the Count of Loon (French: Looz) and Count of Chiny (1336–1361).
Diederik of Heinsberg (French: Thierry, German: Dietrich, English: Theodoric) (died between 17 and 21 January 1361) was the Count of Loon (French: Looz) and Count of Chiny (1336–1361).