Who married Dietrich VII, Count of Cleves?

Dietrich VII (1256–1305) was Count of Cleves from 1275 through 1305. He was the son of Dietrich VI, Count of Cleves and his wife Aleidis von Heinsberg. Dietrich adopted the strategy used in Holland, in the county of Cleves, methodically reclaiming territory with dikes and settling new residents.