Bruno IV von Sayn (died 2 November 1208) was the archbishop of Cologne from 1205 until his death.
[1] In September 1205, Otto's rival for the German throne, Philip of Swabia, began to besiege the city.
[4] On 27 July 1206, Otto and Bruno jointly led an army out of the city confront the besiegers in open battle.
[2] He was released after a year under pressure form Pope Innocent III, who summoned both Bruno and Adolf to Rome.
[3] After the assassination of Philip in September 1208, Otto summoned Bruno to return to Cologne, but the latter died not long after.