Bruno d' Eguisheim-Dagsbourg (Eguisheim, Alsace, June 21st 1002 - Rome, April 19th 1054), crowned Pope the February 12th 1049 under the name of Leon IX . He was especially a pope traveller, working for peace in Europe and he is regarded as the largest Germanic pope of the Middle Ages.

He is born in Eguisheim, in Alsace. Certain historians support however that it was born with Dabo, others with Walscheid, both in the Moselle; it belonged to very an big family, being attached by her Western mother to the Carolingiens of Francie and by her father to kings de Germanie. To the five years age, he was entrusted to the bishop Berthold of Toul to be educated at the school of the cathedral where he showed himself very gifted. Thereafter, it entered young person the chapter of the cathedral. After the death of its tutor, it was called at the court of the king Conrad II (1024 - 1039). In 1026 it led the troops raised to Toul for a campaign to Lombardy. With died of the bishop Hermann de Toul, whereas it was hardly 24 years old, it was proposed by the clergy like its successor and the September 9th 1027, it was devoted by the Archevêque Poppo of Trier. In 1048, with died of Damask II, the emperor of Germany Henri III, with the diet of Worms, chooses it like pope. But wanting to obtain the assent of the clergy and the people of Rome, it went in pilgrimage in the Holy City where it was established pope in 1049. This same year, it prohibits the marriage of Guillaume the Bastard one (William the Conqueror) and of Mathilde of Flanders. In spite of that, the marriage will take place well.

It was a reformer and it fits in the reform known as “Gregorian”. It vigorously fought the Simonie and the Nicolaïsme. It excommunicated and deposited the bishops found guilty. He convenes during his Pontificat twelve Concile S. In 1050, he institutes the Truce of God. Its principal fights were:

• the purchase or the sale of ecclesiastical loads (the Simony);
• the marriage as well as the cohabitation of the priests (the Nicolaïsme);
• the bishops were not to be prefects of the Empire but theologists;
• the return to “Christian” values.

After its death, occurred the Great Schism of the East.

The Saint-Leon is celebrated the April 19th, the birthday day of his death. Its body rests in the Basilique Saint-Pierre.