John I of Isenburg-Limburg

In the City Chronicle of Limburg by Tilemann Elhen von Wolfhagen, written before 1402, John was referred to as the "Blind Lord."

After the death of his father in the Black Forest on a military campaign of King Rudolph I of Habsburg, John inherited Lordship of Limburg.

After Adolf’s election as king, John was a regular and active supporter and rose to become one of his advisors.

John was delegated to arrange the marriage between Adolf’s son Robert of Nassau and Agnes, the daughter of the King Wenceslaus II of Bohemia.

He was also involved in concluding of the marriage contract between Duke Rudolph I of Upper Bavaria and Matilda (Mechtilde) of Nassau (King Adolf's daughter).

Near the beginning of his reign, after a great fire destroyed the entire city of Limburg on May 14, 1289, John led a successful reconstruction effort.