[4] Bishop Géry devoted himself to fighting paganism, ransoming captives and visiting rural districts and villae.

[2] Gaugericus founded churches and abbeys, including a monastery dedicated to St. Medard, to host relics, which contributed powerfully to giving Cambrai both the appearance and functions of a city.

His work was crucial to the development of the city, particularly in terms of the number of buildings he left behind and the pilgrimages he attracted.

He maintained close relations with King Chlothar II, the new lord of Cambrai after the death of Childebert, and assisted at the Council of Paris in 614.

[5][6] A legend holds that Géry built a chapel (to Saint Michael, later the Cathedral of St. Michael and St. Gudula), which soon became a church and gave birth to the city of Brussels, from which he had chased a dragon whose lair was located where the impasse de la Poupée (formerly the impasse du Dragon) was later built.

After serving as bishop for thirty-nine years, he died August 11, 619 and was buried in the church of Saint Médard, which he had founded at Cambrai.