What is Saint Denise is the patron saint of?

Saint Denise (Dionysia, Dionisia) is the name of two separate saints: an African martyr who died in present-day Tunisia (5th century) and a 3rd century martyr who died at Lampsacus in present-day Turkey.

The 3rd century martyr is invoked against headache and motorcycle/bicycle accidents. Her relics are at the Abbey of Flône in Belgium.