Dietrich III, Bishop of Münster
Dietrich of Altena-Isenberg (circa 1196 – 18 July 1226), known as Dietrich III Bishop of Münster (1218–1226). He was closely involved in the preparations for the construction of St. Paul's Cathedral in Münster. On 22 July 1225, he laid the foundation stone for the Dom Church, "Neubau iuxta formam templi Marienfeldensis aedificanda". Early life Dietrich was the son of Count Arnold of Altena from his marriage to Mathilde of Cleve, daughter of Dietrich III, Count of Cleves and Adelheid of Sülzbach. Like his four younger brothers Engelbert, Philip, Bruno and Gottfried, Dietrich was destined for the church. In 1218 he succeeded the Bishop of Münster, Otto I of Oldenburg, after his death during the Fifth Crusade in Syria. In his period as bishop he was known as a mint lord. Dietrich laid the foundation stone for the completion of the new construction of the Saint Paul cathedral in Műnster on 22 July 1225. His role was abruptly cut short and continued by the chapter later that year, when his brother Frederick of Isenberg was involved in the death of their uncle Engelbert II of Berg, Archbishop of Cologne, on 27 November 1226, in Gevelsberg. Rome trip Dietrich left on 1