Henry IV (1195 – 25 February 1247) was the duke of Limburg and count of Berg from 1226 to his death. He was the son of Waleran III, count of Luxembourg and duke of Limburg, and Cunigunda, daughter of Frederick I, Duke of Lorraine.
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County of Berg
Originally lord of Montjoie, he married Irmgard of Berg, heiress of the County of Berg, a daughter of the count Adolf VI, who died at the Siege of Damietta in 1218. Irmgard and Henry could not immediately inherit the county, as it was held by Engelbert I, Archbishop of Cologne. Engelbert being the principal adviser of Frederick II, Holy Roman Emperor, he was confirmed in the county for life, paying a rent to Henry and Ermengard. Engelbert was assassinated on 7 November 1225 and Henry inherited Berg, inheriting Limburg a little while later. He then entrusted Montjoie to his brother Waleran, who already held Faulquemont.
Isenberg
His brother-in-law Frederik of Isenberg was held responsible for the death of the Archbishop of Cologne, Engelbert of Berg Remarkably, through the death of Engelbert, the County of Berg would come to him through his wife Ermgarde, Berg's heiress. After the execution of his brother-in-law Frederik van Isenberg and the death of his sister Sofia a year later, he was concerned about the fate of the orphans. They were brought up at his court in his duchy of Limburg. For the next 20 years he would also support their rights in armed hand against Adolf Earl of Mark, their father's cousin, who took much of their belongings to himself.