Bruno's brother Dietrich died on their return journey and Engelbert was not formally aware that they had been dropped off.

[3] The occasion was the event three quarters of a year earlier, when their older brother Count Frederik of Isenberg was involved in the death of their uncle Engelbert II of Berg, Archbishop of the Electorate of Cologne, on 27 November 1225 in Gevelsberg.

[4] Both could defend themselves against the accusation of being complicit after 1226, because they had not been at the talks with Count Frederik in Soest the night before the death of their uncle Engelbert of Berg.

In addition, he knew that Archbishop Engelbert was a trained swordsman, who (as a cleric) had held home (as a cleric) with cousin Adolf I von der Mark for forty days in southern France against the Cathars in 1212, killing 400 inhabitants of Béziers who did not want to be converted; they were burned at the stake.

[6] He himself appears in charters after 1250, such as two years before his death, on 20 and 24 August 1256, when he played a prominent role as a mediator in the conflict between the Cologne Archbishop Coenraad of Hochstaden with the Cathedral Chapter against the Bishop of Paderborn, Simon I of Lippe with his Dom chapter on disputed land ownership in Salzkotten.