On the island in the Seine Denis built a church and provided for a regular solemnization
of the Divine service. His fearless and indefatigable preaching of the Gospel led to countless conversions.
This aroused the envy, anger and hatred of the heathen priests. They incited the populace against the strangers
and importuned the governor Fescenninus Sisinnius to put a stop by force to the new teaching. Denis with his two
companions were seized and as they persevered in their faith were beheaded (about 275) after many tortures.
Later accounts give a detailed description of the confessors' sufferings. They were scourged, imprisoned, racked,
thrown to wild beasts, burnt at the stake, and finally beheaded. Gregory of Tours simply states: "Beatus Dionysius
Parisiorum episcopus diversis pro Christi nomine adfectus poenis praesentem vitam gladio immente finivit"
(Hist. Franc. I, 30). Their bodies were rescued from the River Seine, the bodies of the three holy martyrs received
an honourable burial through the efforts of a pious matron named Catulla and a small shrine was erected over their graves. Later a chapel built over their tomb later became
the Benedictine Abbey of Saint-Denis. This was later on replaced by
a beautiful basilica (egregium templum) which Venantius celebrated in verse (Carm. I, ii).

St. Denis was one of the Fourteen Holy Helpers (feast 8-8). During the Middle Ages, especially in France and
Germany these saints were credited with particularly efficacious intercessory power.
All had/have also individual feast days. Their special powers of intercession are connected
with incidents in their stories. For example, St. Denis is shown with his head in his hands; therefore,
he is invoked against diabolic possession, headache, rabies, frenzy, and strife.