Poppo of Treffen

In 1020, Poppo commanded the smallest of three armies which Emperor Henry II (who had appointed him as patriarch) led through Italy.

Poppo followed the Apennines and joined the other divisions to besiege Troia, the new fortress of the Byzantine catepan Basil Boioannes.

In 1027, Poppo entered and sacked Grado, the rival patriarchate of northern Italy.

Poppo later consecrated the new large cathedral at Aquileia in dedication to the Virgin Mary on 13 July 1031.

In 1044, Poppo reentered and sacked Grado but he was captured by the newly elected Doge of Venice, Domenico I Contarini.